AP Environmental Science · Policy & Law · Comprehensive Quick Reference · 2026 Exam
Policies, Laws & Treaties
Every major US federal law and international treaty tested on the AP APES exam — with year, key provisions, AP exam angle, and common mistakes. Organized by category for fast lookup.
14 US Federal Laws
10 International Treaties
US Law
Intl. Treaty
⚡ High-Frequency Exam Content
My Study Progress — Policy & Law Reference
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Mastered
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Reviewing
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Not Started
US Law
☁️ Air Quality Laws
MCQ — Which law regulates which pollutant; CAA vs. CAFE distinction
FRQ — Explain how cap-and-trade reduced acid rain (CAA 1990); CAFE mechanism
🔥 Scrubbers regulate SO₂ under CAA — but CO₂ requires separate legislation
Clean Air Act (CAA)
1970 (major amendments 1977 and 1990)
Core purpose: Regulates air pollutants to protect public health and welfare.
Key provisions — 1970: The EPA was established by Reorganization Plan No. 3 (1970), not by the CAA itself; however, the CAA gave EPA its core air quality mandate. Required the EPA to create NAAQS (National Ambient Air Quality Standards) for 6 criteria pollutants (ozone, PM, CO, SO₂, NO₂, lead); required states to write State Implementation Plans (SIPs).
Key provisions — 1990 Amendments: (1) Acid Rain Program — cap-and-trade for SO₂ from power plants; SO₂ emissions fell ~90% by 2020. (2) Regulated 189 hazardous air pollutants (HAPs) including mercury, benzene, dioxins. (3) Addressed stratospheric ozone depletion (CFCs). (4) Stricter vehicle emission standards.
Success metric: 1970–2022: US GDP grew ~280% while six criteria pollutants declined ~78%.
Key provisions — 1970: The EPA was established by Reorganization Plan No. 3 (1970), not by the CAA itself; however, the CAA gave EPA its core air quality mandate. Required the EPA to create NAAQS (National Ambient Air Quality Standards) for 6 criteria pollutants (ozone, PM, CO, SO₂, NO₂, lead); required states to write State Implementation Plans (SIPs).
Key provisions — 1990 Amendments: (1) Acid Rain Program — cap-and-trade for SO₂ from power plants; SO₂ emissions fell ~90% by 2020. (2) Regulated 189 hazardous air pollutants (HAPs) including mercury, benzene, dioxins. (3) Addressed stratospheric ozone depletion (CFCs). (4) Stricter vehicle emission standards.
Success metric: 1970–2022: US GDP grew ~280% while six criteria pollutants declined ~78%.
NAAQS6 Criteria PollutantsCap-and-Trade SO₂HIGH FREQUENCY
CAFE Standards
Corporate Average Fuel Economy Standards — 1975 (Energy Policy and Conservation Act)
Core purpose: Require automakers to meet minimum fleet-average fuel economy; reduce oil dependence and vehicle emissions.
Key provisions: Separate standards for cars and light trucks; averaged across a manufacturer's fleet (not per vehicle); manufacturers pay penalties for non-compliance; increased average fuel economy from ~13 mpg (1975) to ~28 mpg (2023).
Indirect emissions impact: Less fuel burned → proportional reduction in CO₂, CO, NOₓ, VOCs. Largest single factor in reducing US transportation oil consumption.
AP connection: Jevons Paradox — more efficient cars lowered cost per mile, encouraging more driving → partially offset fuel savings. CAFE = efficiency standard, not a conservation mandate.
Key provisions: Separate standards for cars and light trucks; averaged across a manufacturer's fleet (not per vehicle); manufacturers pay penalties for non-compliance; increased average fuel economy from ~13 mpg (1975) to ~28 mpg (2023).
Indirect emissions impact: Less fuel burned → proportional reduction in CO₂, CO, NOₓ, VOCs. Largest single factor in reducing US transportation oil consumption.
AP connection: Jevons Paradox — more efficient cars lowered cost per mile, encouraging more driving → partially offset fuel savings. CAFE = efficiency standard, not a conservation mandate.
Transportation EnergyUnit 6 ConnectionJevons Paradox Trap
| Criteria Pollutant | Primary Source Regulated Under CAA | NAAQS Standard Type | Why Regulated |
|---|---|---|---|
| Ground-level Ozone (O₃) | Secondary pollutant from NOₓ + VOCs + sunlight; vehicles and industry primary precursor sources | Primary (health) + Secondary (welfare/crops) | Respiratory harm; crop damage; smog |
| PM₂.₅ and PM₁₀ | Combustion (vehicles, power plants), construction; secondary PM from SO₂ and NOₓ | Primary (health) + Secondary (visibility) | Cardiovascular and lung disease; ~7M deaths/yr globally |
| Carbon Monoxide (CO) | Incomplete combustion — vehicles primary source | Primary (health) | Binds hemoglobin; reduces O₂ transport |
| Sulfur Dioxide (SO₂) | Coal combustion and metal smelting | Primary (health) + Secondary (acid rain) | Acid rain precursor; respiratory irritant |
| Nitrogen Dioxide (NO₂) | High-temperature combustion (vehicles, power plants) | Primary (health) + Secondary (acid rain/eutrophication) | Ozone and acid rain precursor |
| Lead (Pb) | Previously leaded gasoline (banned 1986); now metal smelters, battery recycling, aviation fuel | Primary (health) | Irreversible neurotoxin; especially harms children's developing brains |
CAA Emission Control Technologies — Which Removes What
| Technology | Pollutant Targeted | Effectiveness | What It CANNOT Remove |
|---|---|---|---|
| Catalytic Converter | CO, NOₓ, VOCs (all three simultaneously) | 90%+ reduction | CO₂, SO₂, PM |
| Flue Gas Desulfurization (Scrubbers) | SO₂ from coal plants | 90–98% SO₂ removal | CO₂ (critical trap!), NOₓ, PM |
| Electrostatic Precipitators (ESP) | Particulate matter only | 99%+ PM by mass | All gases: SO₂, NOₓ, CO, CO₂ |
| Selective Catalytic Reduction (SCR) | NOₓ (converts to N₂ + H₂O) | 70–95% NOₓ reduction | CO₂, SO₂, PM |
| Carbon Capture & Storage (CCS) | CO₂ | Theoretically 90%; not commercially deployed at scale | Nothing deployed at commercial scale yet |
CAA Cap-and-Trade for SO₂ — A Policy Success Story
Mechanism: Regulators set a cap (maximum total SO₂ emissions from power plants). Each plant receives permits for each ton emitted. If a plant reduces below its allocation, it can sell excess permits. If it exceeds allocation, it must buy more. Total emissions cannot exceed the cap; the market determines the most cost-efficient reductions.
Results: SO₂ emissions from the power sector fell ~90% by 2020, at approximately half the projected cost of command-and-control regulation. Acid rain in the northeastern US dramatically decreased. Widely considered the most successful environmental market mechanism in US history.
Command-and-control vs. cap-and-trade: Command-and-control mandates specific technology or emission limits per source. Cap-and-trade achieves the same total emission reduction at lower overall cost by allowing each source to find its own most economical reduction pathway. Both approaches have roles; neither is universally superior.
Common Mistakes
❌ Scrubbers remove SO₂ but NOT CO₂. This is the most-tested CAA distinction. Scrubbers solve acid rain but do nothing for climate change. Only CCS captures CO₂ — and it is not yet commercially deployed at scale.
❌ ESPs remove particles only. They have zero effect on SO₂, NOₓ, CO, or CO₂ — all gases that pass straight through.
❌ Ground-level ozone is NOT directly regulated by setting ozone emission limits — because ozone is a secondary pollutant and has no emission sources. Instead, the CAA regulates the precursor pollutants (NOₓ and VOCs) that react to form ozone.
❌ CAFE Standards are NOT part of the Clean Air Act. They were established under the Energy Policy and Conservation Act (1975). CAFE reduces fuel consumption and its associated emissions indirectly by requiring more efficient vehicles — not by setting emission limits per vehicle (that's the CAA's job).
US Law
💧 Water Quality Laws
MCQ — CWA vs. SDWA distinction; NPDES permits; NPS = hardest to regulate
FRQ — Explain how CWA addresses point sources; why NPS pollution persists
Clean Water Act (CWA)
1972 (Federal Water Pollution Control Act Amendments)
Goal: Restore and maintain the chemical, physical, and biological integrity of US waters; make all waterways "fishable and swimmable."
Core mechanism: NPDES permits (National Pollutant Discharge Elimination System) — any point source discharging pollutants into navigable waters must obtain a permit specifying allowable discharge levels. No permit = illegal discharge.
Section 404: Regulates dredge and fill activities in wetlands; Army Corps of Engineers issues permits. Controversial — scope of wetland protection has been legally contested (Sackett v. EPA 2023 narrowed coverage).
Success: Cuyahoga River (Ohio), which caught fire 13 times from industrial pollution (most notably 1969), now supports fish populations. Lake Erie recovery from near-death. Major reduction in point source pollution nationwide.
Ongoing challenge: Agricultural NPS pollution now dominates US water quality problems. ~46% of US rivers still in poor biological condition (EPA 2013).
Core mechanism: NPDES permits (National Pollutant Discharge Elimination System) — any point source discharging pollutants into navigable waters must obtain a permit specifying allowable discharge levels. No permit = illegal discharge.
Section 404: Regulates dredge and fill activities in wetlands; Army Corps of Engineers issues permits. Controversial — scope of wetland protection has been legally contested (Sackett v. EPA 2023 narrowed coverage).
Success: Cuyahoga River (Ohio), which caught fire 13 times from industrial pollution (most notably 1969), now supports fish populations. Lake Erie recovery from near-death. Major reduction in point source pollution nationwide.
Ongoing challenge: Agricultural NPS pollution now dominates US water quality problems. ~46% of US rivers still in poor biological condition (EPA 2013).
NPDES PermitsPoint SourceWetlands Section 404HIGH FREQUENCY
Safe Drinking Water Act (SDWA)
1974
Core purpose: Sets standards for drinking water quality at the tap — protects public health from contaminated public water supplies.
Key mechanism: EPA sets Maximum Contaminant Levels (MCLs) — the maximum allowable concentration of a contaminant in drinking water. Public water systems must test and treat to meet MCLs and report results to customers.
CWA vs. SDWA distinction (AP trap): CWA regulates discharges into waterways (preventing contamination at the source). SDWA regulates drinking water quality at the tap (treating contaminated water for human consumption). Two different points in the water cycle; two different laws.
Case study: Flint, Michigan lead crisis (2014–2019) — city switched water source without corrosion control → lead leached from old pipes → 10,000+ children exposed to elevated lead levels. SDWA provisions were not properly enforced; infrastructure (lead service lines) caused contamination even after treatment.
Key mechanism: EPA sets Maximum Contaminant Levels (MCLs) — the maximum allowable concentration of a contaminant in drinking water. Public water systems must test and treat to meet MCLs and report results to customers.
CWA vs. SDWA distinction (AP trap): CWA regulates discharges into waterways (preventing contamination at the source). SDWA regulates drinking water quality at the tap (treating contaminated water for human consumption). Two different points in the water cycle; two different laws.
Case study: Flint, Michigan lead crisis (2014–2019) — city switched water source without corrosion control → lead leached from old pipes → 10,000+ children exposed to elevated lead levels. SDWA provisions were not properly enforced; infrastructure (lead service lines) caused contamination even after treatment.
MCLsDrinking Water AT the TapCWA ≠ SDWA Trap
Marine Protection, Research & Sanctuaries Act (MPRSA)
1972 (Ocean Dumping Act)
Core purpose: Regulates ocean dumping of materials that would adversely affect marine environments, human health, or economic potential.
Key provision: Prohibited dumping of most waste (industrial, municipal sewage sludge) into US ocean waters by 1988. Only dredged material (under strict permits) may be dumped offshore under current law.
AP relevance: Historically, sewage sludge, industrial waste, and even radioactive waste were dumped at sea — "out of sight, out of mind." MPRSA ended this practice. Connects to Unit 8 solid waste and ocean pollution topics.
Key provision: Prohibited dumping of most waste (industrial, municipal sewage sludge) into US ocean waters by 1988. Only dredged material (under strict permits) may be dumped offshore under current law.
AP relevance: Historically, sewage sludge, industrial waste, and even radioactive waste were dumped at sea — "out of sight, out of mind." MPRSA ended this practice. Connects to Unit 8 solid waste and ocean pollution topics.
Ocean Dumping BanUnit 8 Connection
Point Source vs. Nonpoint Source — The Critical Distinction
Feature
Point Source
Nonpoint Source (NPS)
Definition
Pollution from a single identifiable discharge location (pipe, outfall, channel)
Pollution from diffuse, widespread areas; no single discharge point
US water quality status
Dramatically reduced post-CWA; declining problem since 1972
Agricultural NPS = #1 cause of US water quality impairment
Regulatory tool
NPDES permit system under CWA; continuous monitoring; enforceable limits
Best Management Practices (BMPs); land use planning; voluntary programs; no permit system
Examples
Factory wastewater pipe; sewage treatment outfall; mine drainage; oil tanker spill
Agricultural fertilizer/pesticide runoff; urban stormwater; logging road erosion; atmospheric deposition
Why NPS is harder
Can monitor, permit, and enforce at a single location
Comes from millions of acres of farmland; no single responsible party; weather-dependent
Common Mistakes
❌ CWA ≠ SDWA. The Clean Water Act regulates what gets discharged INTO waterways. The Safe Drinking Water Act regulates drinking water quality AT THE TAP. A factory illegally dumping into a river violates the CWA. A water utility providing lead-contaminated water violates the SDWA. Two completely different laws at two different points in the water cycle.
❌ The CWA was hugely successful at reducing point source pollution, but NPS pollution (especially agricultural) remains the dominant US water quality problem. The CWA is both a great success story and an unfinished one simultaneously.
❌ The CWA only covers "navigable waters." The scope of what qualifies as "navigable" (including isolated wetlands and small streams) has been narrowed by recent Supreme Court decisions (Rapanos v. United States 2006; Sackett v. EPA 2023), reducing wetland protections.
US Law
🌿 Land, Waste & Chemical Laws
MCQ — RCRA governs active waste; CERCLA/Superfund governs abandoned sites
FRQ — Explain Superfund liability; describe RCRA cradle-to-grave tracking
RCRA
Resource Conservation and Recovery Act — 1976
Core purpose: Governs the disposal of solid and hazardous waste generated at currently operating facilities; established "cradle-to-grave" tracking of hazardous waste.
Key provisions: (1) Banned open dumping (illegal in US since RCRA); (2) Established standards for sanitary landfills (liners, leachate collection, groundwater monitoring, post-closure care); (3) Hazardous waste tracking — manifests must accompany hazardous waste from generation through treatment, storage, and disposal; (4) Authorized "Subtitle D" regulations for municipal solid waste landfills.
RCRA vs. CERCLA (AP critical distinction): RCRA governs ongoing, active generation and disposal of waste. CERCLA (Superfund) governs abandoned, historical contaminated sites.
Key provisions: (1) Banned open dumping (illegal in US since RCRA); (2) Established standards for sanitary landfills (liners, leachate collection, groundwater monitoring, post-closure care); (3) Hazardous waste tracking — manifests must accompany hazardous waste from generation through treatment, storage, and disposal; (4) Authorized "Subtitle D" regulations for municipal solid waste landfills.
RCRA vs. CERCLA (AP critical distinction): RCRA governs ongoing, active generation and disposal of waste. CERCLA (Superfund) governs abandoned, historical contaminated sites.
Active Waste SitesCradle-to-GraveSanitary LandfillsRCRA ≠ CERCLA Trap
CERCLA / Superfund
Comprehensive Environmental Response, Compensation, and Liability Act — 1980
Core purpose: Established a federal program to clean up abandoned or uncontrolled hazardous waste sites that threaten human health or the environment.
Key mechanisms: (1) National Priorities List (NPL) — list of the most contaminated sites in the US requiring long-term cleanup ("Superfund sites"); ~1,300 sites currently on NPL. (2) Polluter Pays Principle — "Potentially Responsible Parties" (PRPs) can be held liable for cleanup costs, even if they legally disposed of waste decades ago. Liability is retroactive, strict (no negligence required), joint and several (any one party can be held for full cost). (3) Superfund Trust Fund: when no responsible party can be found, federal funds pay for cleanup.
AP significance: Love Canal, NY (1970s) — residential neighborhood built on former chemical dump; birth defects and cancers prompted evacuation and directly motivated CERCLA's passage.
Key mechanisms: (1) National Priorities List (NPL) — list of the most contaminated sites in the US requiring long-term cleanup ("Superfund sites"); ~1,300 sites currently on NPL. (2) Polluter Pays Principle — "Potentially Responsible Parties" (PRPs) can be held liable for cleanup costs, even if they legally disposed of waste decades ago. Liability is retroactive, strict (no negligence required), joint and several (any one party can be held for full cost). (3) Superfund Trust Fund: when no responsible party can be found, federal funds pay for cleanup.
AP significance: Love Canal, NY (1970s) — residential neighborhood built on former chemical dump; birth defects and cancers prompted evacuation and directly motivated CERCLA's passage.
Abandoned SitesPolluter PaysLove CanalHIGH FREQUENCY
TSCA
Toxic Substances Control Act — 1976 (reformed 2016: Frank Lautenberg Chemical Safety for the 21st Century Act)
Core purpose: Gives EPA authority to require reporting, record-keeping, and testing requirements and restrictions for chemical substances and/or mixtures.
Historic use: PCBs banned under TSCA (1979). Asbestos regulation attempted (partially overturned by courts). Original TSCA was widely considered ineffective — "grandfathered" ~62,000 chemicals without requiring safety review.
2016 Lautenberg Reform: Strengthened TSCA substantially; required EPA to evaluate existing chemicals and set risk-based standards; gave EPA clear authority to ban hazardous substances. PFAS regulation under TSCA is an active current issue.
Historic use: PCBs banned under TSCA (1979). Asbestos regulation attempted (partially overturned by courts). Original TSCA was widely considered ineffective — "grandfathered" ~62,000 chemicals without requiring safety review.
2016 Lautenberg Reform: Strengthened TSCA substantially; required EPA to evaluate existing chemicals and set risk-based standards; gave EPA clear authority to ban hazardous substances. PFAS regulation under TSCA is an active current issue.
Chemical SafetyPCB Ban 1979PFAS Active Issue
FIFRA
Federal Insecticide, Fungicide, and Rodenticide Act — 1947 (major revisions 1972, 1988)
Core purpose: Regulates the sale, distribution, and use of pesticides in the United States; requires EPA registration of all pesticides before sale.
Key provisions: All pesticides must be registered with EPA; registration requires demonstration that the pesticide will not cause "unreasonable adverse effects" on humans or the environment; restricted-use pesticides require licensed applicators; establishes tolerance levels (maximum residue limits) for pesticides in food.
AP connection: DDT was deregistered (effectively banned) under FIFRA in 1972 after Rachel Carson's Silent Spring (1962) documented its ecological effects (eggshell thinning, raptor decline). FIFRA banning or restricting harmful pesticides is a key policy mechanism in Unit 5.
Key provisions: All pesticides must be registered with EPA; registration requires demonstration that the pesticide will not cause "unreasonable adverse effects" on humans or the environment; restricted-use pesticides require licensed applicators; establishes tolerance levels (maximum residue limits) for pesticides in food.
AP connection: DDT was deregistered (effectively banned) under FIFRA in 1972 after Rachel Carson's Silent Spring (1962) documented its ecological effects (eggshell thinning, raptor decline). FIFRA banning or restricting harmful pesticides is a key policy mechanism in Unit 5.
Pesticide RegistrationDDT Ban 1972Unit 5 Connection
Common Mistakes
❌ RCRA ≠ CERCLA (Superfund). RCRA = active, currently-operating waste sites (tracking and standards). CERCLA/Superfund = abandoned, historically contaminated sites (cleanup liability). This is a frequently tested distinction.
❌ CERCLA's liability is retroactive — companies can be held responsible for cleanup costs for waste they legally disposed of decades before CERCLA existed. "We disposed of it legally at the time" is not a defense under Superfund.
❌ FIFRA does not ban all use of registered pesticides. It requires a risk-benefit analysis. Restricted-use pesticides are still available to licensed applicators. A full ban (like DDT in 1972) requires deregistration of the substance under FIFRA.
US Law
🏹 Biodiversity & Species Laws
MCQ — ESA applies to private land; "take" definition; CITES Appendix I vs II
FRQ — Explain ESA critical habitat; California condor captive breeding
🔥 ESA applies to ALL land (public AND private) — not just federal land
Endangered Species Act (ESA)
1973 — US domestic law
Core purpose: Protect species threatened with extinction and the ecosystems on which they depend. Administered by US Fish & Wildlife Service (terrestrial) and NOAA Fisheries (marine).
Section 4 — Listing: Species listed as "Threatened" or "Endangered" based on population size, rate of decline, geographic range, disease/predation, inadequacy of regulations. Must also designate critical habitat (specific geographic areas essential to species conservation) and develop recovery plans.
Section 7 — Federal consultation: All federal agencies must consult with FWS/NOAA to ensure their actions do not "jeopardize the continued existence" of listed species or adversely modify critical habitat. Applies to federal permits, funding, and activities.
Section 9 — Take prohibition: Prohibits "take" (harm, harass, pursue, hunt, shoot, wound, kill, trap, capture, collect) of listed species by any person, on any land (public or private). Harm includes significant habitat modification if it actually kills or injures wildlife.
Section 10 — Incidental Take Permit (ITP): Private landowners may obtain an ITP by developing a Habitat Conservation Plan (HCP) that minimizes and mitigates incidental take. Provides legal pathway for development with mitigation.
Success examples: Bald eagle (delisted 2007); peregrine falcon (delisted 1999); gray wolf; humpback whale; California condor (>500 birds from 27 in 1987).
Section 4 — Listing: Species listed as "Threatened" or "Endangered" based on population size, rate of decline, geographic range, disease/predation, inadequacy of regulations. Must also designate critical habitat (specific geographic areas essential to species conservation) and develop recovery plans.
Section 7 — Federal consultation: All federal agencies must consult with FWS/NOAA to ensure their actions do not "jeopardize the continued existence" of listed species or adversely modify critical habitat. Applies to federal permits, funding, and activities.
Section 9 — Take prohibition: Prohibits "take" (harm, harass, pursue, hunt, shoot, wound, kill, trap, capture, collect) of listed species by any person, on any land (public or private). Harm includes significant habitat modification if it actually kills or injures wildlife.
Section 10 — Incidental Take Permit (ITP): Private landowners may obtain an ITP by developing a Habitat Conservation Plan (HCP) that minimizes and mitigates incidental take. Provides legal pathway for development with mitigation.
Success examples: Bald eagle (delisted 2007); peregrine falcon (delisted 1999); gray wolf; humpback whale; California condor (>500 birds from 27 in 1987).
ListingCritical HabitatTake ProhibitionPrivate Land AppliesHIGH FREQUENCY
Marine Mammal Protection Act (MMPA)
1972
Core purpose: Prohibits the "take" (harass, hunt, capture, kill) of marine mammals in US waters and by US citizens in international waters; prohibits import of marine mammals and products.
AP significance: Protects whales, dolphins, seals, sea otters, polar bears, manatees, and other marine mammals. Incidental take (e.g., bycatch in commercial fishing) regulated through "incidental take authorizations." Connects to Unit 5 (overfishing, bycatch) and Unit 9 (ocean warming impacts on marine mammals, military sonar).
AP significance: Protects whales, dolphins, seals, sea otters, polar bears, manatees, and other marine mammals. Incidental take (e.g., bycatch in commercial fishing) regulated through "incidental take authorizations." Connects to Unit 5 (overfishing, bycatch) and Unit 9 (ocean warming impacts on marine mammals, military sonar).
Marine MammalsBycatch RegulationUnit 5 & 9 Connection
Migratory Bird Treaty Act (MBTA)
1918 — implementing the US-Canada Migratory Bird Convention
Core purpose: Protects migratory birds by making it illegal to pursue, hunt, take, capture, kill, or sell migratory birds, their eggs, feathers, or nests without a permit. Covers >1,000 bird species.
AP significance: One of the oldest US federal environmental laws. Oil spills that kill migratory birds (e.g., Deepwater Horizon 2010 — 1+ million birds killed) trigger MBTA enforcement. Wind turbines and power lines can incidentally kill birds — industry must work with USFWS to minimize kills.
AP significance: One of the oldest US federal environmental laws. Oil spills that kill migratory birds (e.g., Deepwater Horizon 2010 — 1+ million birds killed) trigger MBTA enforcement. Wind turbines and power lines can incidentally kill birds — industry must work with USFWS to minimize kills.
1918 LawOil Spill LiabilityWind Turbine Conflict
ESA Critical Habitat vs. Recovery Plan — Know the Difference
Feature
Critical Habitat Designation
Recovery Plan
What it is
Specific geographic areas identified as essential for species conservation, whether or not the species currently occupies them
Document outlining actions needed to recover listed species to the point where ESA protection is no longer needed
Legal force
Federal agencies may not fund, authorize, or carry out actions that "adversely modify" critical habitat (Section 7)
Guides management actions; not legally binding in itself but provides the scientific basis for decision-making
Example
Northern spotted owl critical habitat designation (Pacific Northwest old-growth forests) prevented logging in designated areas
California condor recovery plan — captive breeding, lead ammunition restrictions, power line retrofitting, public education
Common Mistakes
❌ The ESA does NOT apply only to federal/public land. Section 9's take prohibition applies to any person on any land — public or private. This is one of the ESA's most powerful and controversial features. Private landowners developing their own land can be prosecuted if they "harm" listed species by significantly modifying habitat.
❌ "Endangered" and "Threatened" are both ESA listing categories but with different legal meanings. Threatened = likely to become endangered within the foreseeable future. Endangered = currently in danger of extinction throughout all or a significant portion of its range. Both receive ESA protections; Threatened may receive slightly modified protections in some cases.
US Law
🔢 Environmental Planning & Land Use Laws
MCQ — NEPA requires EIS process; public land management laws
FRQ — Explain NEPA's environmental impact assessment requirement
NEPA
National Environmental Policy Act — 1969 (signed 1970)
Core purpose: Requires federal agencies to assess the environmental impact of their proposed actions BEFORE proceeding; often called the "environmental impact statement law."
Key process: (1) Environmental Assessment (EA): determines whether a full EIS is needed. If significant impact likely → proceed to EIS. (2) Environmental Impact Statement (EIS): comprehensive document describing: the proposed action; alternatives (including no action); likely environmental impacts; mitigation measures; public comments. Federal agency must consider but is not required to choose the least damaging alternative.
What NEPA is NOT: NEPA does not require agencies to make the most environmentally protective decision. It requires them to consider environmental impacts — a procedural law, not a substantive environmental protection law. The federal agency can still choose a damaging option after completing an EIS.
Also: Established the Council on Environmental Quality (CEQ) to oversee NEPA implementation and coordinate federal environmental policy.
Key process: (1) Environmental Assessment (EA): determines whether a full EIS is needed. If significant impact likely → proceed to EIS. (2) Environmental Impact Statement (EIS): comprehensive document describing: the proposed action; alternatives (including no action); likely environmental impacts; mitigation measures; public comments. Federal agency must consider but is not required to choose the least damaging alternative.
What NEPA is NOT: NEPA does not require agencies to make the most environmentally protective decision. It requires them to consider environmental impacts — a procedural law, not a substantive environmental protection law. The federal agency can still choose a damaging option after completing an EIS.
Also: Established the Council on Environmental Quality (CEQ) to oversee NEPA implementation and coordinate federal environmental policy.
EIS RequiredProcedural LawFederal ProjectsNEPA Doesn't Prohibit Actions
Multiple-Use Public Land Laws
National Forest Management Act (1976) · Federal Land Policy and Management Act (1976)
NFMA (1976): Governs management of US National Forests (193 million acres). Requires forest management plans; mandates consideration of multiple uses (timber, recreation, watershed, wildlife, grazing, mining) AND environmental protection; prohibits even-age management (clearcutting) in specified circumstances.
FLPMA (1976): Governs Bureau of Land Management (BLM) lands (245 million acres of public domain). Establishes "multiple-use, sustained yield" as the management principle. BLM manages for grazing, mining, oil/gas drilling, recreation, and conservation simultaneously. Prior to FLPMA, BLM had no comprehensive management statute.
Key concept — Multiple Use vs. Preservation: Multiple-use lands (National Forests, BLM) allow extractive activities (logging, mining, grazing, drilling) alongside conservation. National Parks are managed for preservation (no extractive activities). Wilderness Areas are the most protected category of federal land (no motorized vehicles, no development, no extractive uses).
FLPMA (1976): Governs Bureau of Land Management (BLM) lands (245 million acres of public domain). Establishes "multiple-use, sustained yield" as the management principle. BLM manages for grazing, mining, oil/gas drilling, recreation, and conservation simultaneously. Prior to FLPMA, BLM had no comprehensive management statute.
Key concept — Multiple Use vs. Preservation: Multiple-use lands (National Forests, BLM) allow extractive activities (logging, mining, grazing, drilling) alongside conservation. National Parks are managed for preservation (no extractive activities). Wilderness Areas are the most protected category of federal land (no motorized vehicles, no development, no extractive uses).
National ForestsBLM LandsMultiple UseUnit 5 Connection
Common Mistakes
❌ NEPA does NOT force the federal government to choose the most environmentally protective option. It requires agencies to disclose and consider environmental impacts through the EIS process, then allows them to proceed with the action. NEPA is a procedural law, not a substantive protection law. A federal agency can complete a thorough EIS and then build the damaging highway anyway.
❌ National Parks ≠ National Forests ≠ BLM lands. These are three distinct categories with different management mandates. National Parks (managed by NPS): preservation — no extractive activities. National Forests (USFS, NFMA): multiple use including logging, grazing, mining. BLM lands (FLPMA): multiple use including oil/gas, grazing, mining, recreation.
Intl. Treaty
🌍 International Atmosphere & Climate Treaties
MCQ — Montreal Protocol = universally ratified; Paris = voluntary NDCs; Kyoto = US never ratified
FRQ — Compare Montreal vs. Paris; explain why ozone solution was easier than climate
🔥 HFCs in Kigali Amendment = solved ozone but created climate problem
Montreal Protocol
Protocol on Substances That Deplete the Ozone Layer — 1987
Adopted: September 16, 1987; entered into force 1989. 197 parties — universally ratified (only UN treaty ratified by every country on Earth).
Core mechanism: Phase-out schedule for ozone-depleting substances (ODS). CFCs phased out in developed nations by 1996; developing nations by 2010. Regulated: CFCs, HCFCs (transitional), halons (fire extinguishers), methyl bromide, carbon tetrachloride.
Equity provision — CBDR: Common But Differentiated Responsibilities. Multilateral Fund provided financial and technical assistance to developing nations so they could transition without disproportionate economic burden. This equity provision was critical for achieving universal ratification.
Kigali Amendment (2016): Added phase-down schedule for HFCs (the CFC replacements that don't deplete ozone but are potent GHGs with GWP 1,000–23,500).
Results: Global CFC production fell >99% since 1988; Antarctic ozone hole shrinking since ~2000; projected full recovery ~2065–2070.
Core mechanism: Phase-out schedule for ozone-depleting substances (ODS). CFCs phased out in developed nations by 1996; developing nations by 2010. Regulated: CFCs, HCFCs (transitional), halons (fire extinguishers), methyl bromide, carbon tetrachloride.
Equity provision — CBDR: Common But Differentiated Responsibilities. Multilateral Fund provided financial and technical assistance to developing nations so they could transition without disproportionate economic burden. This equity provision was critical for achieving universal ratification.
Kigali Amendment (2016): Added phase-down schedule for HFCs (the CFC replacements that don't deplete ozone but are potent GHGs with GWP 1,000–23,500).
Results: Global CFC production fell >99% since 1988; Antarctic ozone hole shrinking since ~2000; projected full recovery ~2065–2070.
197 PartiesUniversal RatificationCBDRKigali 2016HIGH FREQUENCY
Kyoto Protocol
1997 — UNFCCC Conference, Kyoto, Japan
Core mechanism: First binding international treaty on GHG emissions reductions. Required developed nations (Annex I parties) to reduce GHG emissions to below 1990 levels during 2008–2012 commitment period. Established international carbon trading mechanisms.
Key limitations: (1) US never ratified — Senate voted 95-0 against ratification before it was even sent; (2) No binding commitments for developing nations (China, India) — major emitters excluded from requirements; (3) Canada withdrew in 2011; (4) Second commitment period (2013–2020) had even fewer participants.
Legacy: Important precedent establishing that climate change requires binding international agreement; "CBDR" framework for differentiating developed vs. developing nation obligations; introduced GHG accounting methodologies now used globally.
Key limitations: (1) US never ratified — Senate voted 95-0 against ratification before it was even sent; (2) No binding commitments for developing nations (China, India) — major emitters excluded from requirements; (3) Canada withdrew in 2011; (4) Second commitment period (2013–2020) had even fewer participants.
Legacy: Important precedent establishing that climate change requires binding international agreement; "CBDR" framework for differentiating developed vs. developing nation obligations; introduced GHG accounting methodologies now used globally.
1st Binding GHG TreatyUS Never RatifiedAnnex I Nations OnlyUS Never Ratified Trap
Paris Agreement
2015 — COP 21, Paris, France; under UNFCCC
Core commitment: 196 parties committed to hold warming to "well below 2°C, preferably 1.5°C" above pre-industrial levels. Entered into force November 2016.
Key mechanism — NDCs: Each nation sets its own Nationally Determined Contributions (NDCs) — voluntary pledges describing emission reduction targets and climate actions. NDCs must be submitted every 5 years and each successive NDC should be more ambitious.
No enforcement mechanism: Unlike Kyoto, there is no penalty for failing to meet NDC targets. Transparency and global pressure are the primary accountability mechanisms.
Current trajectory: Current NDC pledges are insufficient for the 1.5°C goal. Projected warming on current trajectory is ~2.5–3°C by 2100. However, the Paris framework provides the international architecture and regular review mechanism needed to progressively tighten commitments.
US participation: Obama signed (2016); Trump withdrew (2020); Biden rejoined (2021); Trump withdrew again (2025).
Key mechanism — NDCs: Each nation sets its own Nationally Determined Contributions (NDCs) — voluntary pledges describing emission reduction targets and climate actions. NDCs must be submitted every 5 years and each successive NDC should be more ambitious.
No enforcement mechanism: Unlike Kyoto, there is no penalty for failing to meet NDC targets. Transparency and global pressure are the primary accountability mechanisms.
Current trajectory: Current NDC pledges are insufficient for the 1.5°C goal. Projected warming on current trajectory is ~2.5–3°C by 2100. However, the Paris framework provides the international architecture and regular review mechanism needed to progressively tighten commitments.
US participation: Obama signed (2016); Trump withdrew (2020); Biden rejoined (2021); Trump withdrew again (2025).
1.5°C TargetVoluntary NDCsNo Enforcement196 PartiesHIGH FREQUENCY
IPCC
Intergovernmental Panel on Climate Change — established 1988
Not a treaty, but essential AP context: The IPCC is the leading international body for the assessment of climate change, established by UNEP and WMO.
What IPCC does: Synthesizes and evaluates thousands of peer-reviewed scientific publications; does NOT conduct original research; publishes Assessment Reports every 5–7 years. AR6 (2021–22): "unequivocal" that human influence has warmed the climate; 1.1°C already reached; 1.5°C likely within a decade without rapid cuts.
AP significance: IPCC represents the global scientific consensus on climate change. Its reports are the foundation for international climate negotiations (UNFCCC, Paris Agreement). When AP questions reference "climate scientists project" or "scientific consensus," they mean IPCC.
What IPCC does: Synthesizes and evaluates thousands of peer-reviewed scientific publications; does NOT conduct original research; publishes Assessment Reports every 5–7 years. AR6 (2021–22): "unequivocal" that human influence has warmed the climate; 1.1°C already reached; 1.5°C likely within a decade without rapid cuts.
AP significance: IPCC represents the global scientific consensus on climate change. Its reports are the foundation for international climate negotiations (UNFCCC, Paris Agreement). When AP questions reference "climate scientists project" or "scientific consensus," they mean IPCC.
Scientific BodyNot Original ResearchAssessment ReportsGlobal Consensus
Montreal Protocol vs. Paris Agreement — Why Ozone Was Easier to Solve
Feature
Montreal Protocol (1987)
Paris Agreement (2015)
Substances targeted
CFCs and related ODS — produced by a small number of chemical companies for specific applications
All GHGs (CO₂, CH₄, N₂O, F-gases) from virtually every sector of the global economy
Economic disruption
Modest — replace refrigerants and aerosol propellants in a few industries; substitutes existed
Massive — requires transforming entire energy systems (80% of global energy); transportation; industry; agriculture
Binding commitment?
Yes — legally binding phase-out schedule with specific timelines
No — NDCs are voluntary; no enforcement mechanism for failing to meet targets
Ratification
197 parties — universal ratification (the only UN treaty)
~194 parties (2025); US has twice withdrawn (most recently effective January 2026); major emitter commitments insufficient
Evidence of harm
Ozone hole was directly measurable; increased skin cancer was personal and immediate
Harms manifest over decades; diffuse; distributed globally; economically complex
Success to date
CFC production fell >99%; ozone layer recovering; measurable improvement
Current pledges lead to ~2.5–3°C warming; insufficient for 1.5°C target; progress accelerating but insufficient
Common CBDR principle
Multilateral Fund for developing nations
Green Climate Fund; differentiated NDC expectations for developing nations
Intl. Treaty
🏸 International Biodiversity & Trade Treaties
MCQ — CITES Appendix I = no commercial trade; CBD 30x30; US never ratified CBD
FRQ — Apply CITES to a specific species trade scenario
CITES
Convention on International Trade in Endangered Species of Wild Fauna and Flora — 1973
Core purpose: Regulate international trade in wildlife to ensure it doesn't threaten species survival. 183 parties. Administered through a permit system based on three appendices.
Appendix I: Species threatened with extinction. Commercial trade prohibited. Non-commercial trade (scientific research, captive breeding) may be permitted with documentation. Examples: tigers, elephants (some populations), rhinos, gorillas, sea turtles, giant pandas, many orchids.
Appendix II: Species not currently threatened but could become so if trade is not controlled. Commercial trade permitted with export permits demonstrating trade will not be detrimental. Examples: many coral species, most parrots, American black bear, whale sharks, mako sharks.
Appendix III: Species protected in at least one country that requests other parties' assistance in controlling trade. Export permits required from that country.
Key examples: Ivory trade ban for African elephants (Appendix I for most populations since 1989) helped stabilize populations; reduced poaching. CITES does NOT cover domestic trade within a country — only international trade. Most commercially fished species (tuna, cod) are NOT listed under CITES — fisheries managed by other mechanisms.
Appendix I: Species threatened with extinction. Commercial trade prohibited. Non-commercial trade (scientific research, captive breeding) may be permitted with documentation. Examples: tigers, elephants (some populations), rhinos, gorillas, sea turtles, giant pandas, many orchids.
Appendix II: Species not currently threatened but could become so if trade is not controlled. Commercial trade permitted with export permits demonstrating trade will not be detrimental. Examples: many coral species, most parrots, American black bear, whale sharks, mako sharks.
Appendix III: Species protected in at least one country that requests other parties' assistance in controlling trade. Export permits required from that country.
Key examples: Ivory trade ban for African elephants (Appendix I for most populations since 1989) helped stabilize populations; reduced poaching. CITES does NOT cover domestic trade within a country — only international trade. Most commercially fished species (tuna, cod) are NOT listed under CITES — fisheries managed by other mechanisms.
Appendix I: No Commercial TradeAppendix II: Regulated Trade183 PartiesHIGH FREQUENCY
Convention on Biological Diversity (CBD)
1992 — Rio de Janeiro Earth Summit; Kunming-Montreal Global Biodiversity Framework 2022
Core purpose: Three objectives: (1) Conservation of biological diversity; (2) Sustainable use of biodiversity components; (3) Fair and equitable sharing of benefits from genetic resources (Access and Benefit Sharing).
196 parties — but US has NOT ratified (the only UN member state that has not). The US signed but Senate never voted on ratification.
Kunming-Montreal Global Biodiversity Framework (2022): Most recent major CBD agreement. Key target: "30x30" — protect at least 30% of Earth's land and 30% of oceans by 2030. This would roughly double current protected area coverage (~17% land, ~8% ocean as of 2023).
Nagoya Protocol (2010): CBD protocol governing access to genetic resources and fair sharing of benefits from their use. Relevant to bioprospecting and pharmaceutical development from wild species.
196 parties — but US has NOT ratified (the only UN member state that has not). The US signed but Senate never voted on ratification.
Kunming-Montreal Global Biodiversity Framework (2022): Most recent major CBD agreement. Key target: "30x30" — protect at least 30% of Earth's land and 30% of oceans by 2030. This would roughly double current protected area coverage (~17% land, ~8% ocean as of 2023).
Nagoya Protocol (2010): CBD protocol governing access to genetic resources and fair sharing of benefits from their use. Relevant to bioprospecting and pharmaceutical development from wild species.
30x30 TargetUS Not Ratified196 PartiesUS Not Ratified Trap
UN Convention on the Law of the Sea (UNCLOS)
1982 — entered into force 1994
Core purpose: Establishes the legal framework for ocean governance; defines rights and responsibilities of nations with respect to their use of the world's oceans.
Key provisions: Exclusive Economic Zones (EEZ) — coastal nations have sovereign rights over resources (fishing, oil/gas, mining) within 200 nautical miles of their coast; governs territorial waters (12 nm); established International Seabed Authority for mineral resources in international waters; established International Tribunal for the Law of the Sea.
AP significance: US has NOT ratified UNCLOS (Senate opposition) but largely complies with it as customary international law. EEZs are directly relevant to fisheries management (overfishing, Unit 5), deep-sea mining, and ocean pollution. The convention's framework for high-seas fisheries management influences all discussion of international fish stock management.
Key provisions: Exclusive Economic Zones (EEZ) — coastal nations have sovereign rights over resources (fishing, oil/gas, mining) within 200 nautical miles of their coast; governs territorial waters (12 nm); established International Seabed Authority for mineral resources in international waters; established International Tribunal for the Law of the Sea.
AP significance: US has NOT ratified UNCLOS (Senate opposition) but largely complies with it as customary international law. EEZs are directly relevant to fisheries management (overfishing, Unit 5), deep-sea mining, and ocean pollution. The convention's framework for high-seas fisheries management influences all discussion of international fish stock management.
EEZ 200nmFisheries RightsUS Not RatifiedUnit 5 Connection
Common Mistakes
❌ CITES Appendix I bans commercial trade, not all trade. Non-commercial trade (scientific research exchanges, zoo conservation breeding programs) may be permitted with documentation. This distinction is frequently tested.
❌ CITES does NOT cover domestic trade. A country can have a legal domestic market in a CITES Appendix I species if it was obtained before the listing or bred in captivity. The treaty only governs international trade across borders.
❌ The US has NOT ratified CBD or UNCLOS. This is a common AP trap — students assume the US has ratified all major international environmental agreements. US is a party to: CITES (1975), Montreal Protocol (1988), Paris Agreement (rejoined 2021). US is NOT a party to: CBD, UNCLOS.
Intl. Treaty
☢ International Chemical & Waste Treaties
MCQ — Stockholm Convention covers POPs; Basel governs hazardous waste trade
FRQ — Explain why POPs require international regulation (global distillation)
Stockholm Convention on POPs
2001 — entered into force 2004
Core purpose: Protect human health and the environment from Persistent Organic Pollutants (POPs) — chemicals that are persistent, bioaccumulative, toxic, and subject to long-range transport.
Original "Dirty Dozen": DDT, PCBs, dioxins, furans, aldrin, dieldrin, endrin, heptachlor, chlordane, mirex, toxaphene, hexachlorobenzene. Since 2004, over 30 additional substances added (including PFOA and PFOS in 2019).
Three annexes: Annex A = eliminate production and use; Annex B = restrict production and use (DDT allowed for malaria vector control); Annex C = minimize unintentional releases (dioxins, furans from combustion).
Why international regulation is needed: POPs volatilize in warm tropical/temperate regions, travel thousands of km in air currents, and deposit in cold polar regions ("global distillation" or "grasshopper effect"). A chemical banned in one country still contaminates another country's wildlife if neighboring countries continue using it. POPs are found in Arctic polar bears and Inuit populations despite no local industrial sources.
Original "Dirty Dozen": DDT, PCBs, dioxins, furans, aldrin, dieldrin, endrin, heptachlor, chlordane, mirex, toxaphene, hexachlorobenzene. Since 2004, over 30 additional substances added (including PFOA and PFOS in 2019).
Three annexes: Annex A = eliminate production and use; Annex B = restrict production and use (DDT allowed for malaria vector control); Annex C = minimize unintentional releases (dioxins, furans from combustion).
Why international regulation is needed: POPs volatilize in warm tropical/temperate regions, travel thousands of km in air currents, and deposit in cold polar regions ("global distillation" or "grasshopper effect"). A chemical banned in one country still contaminates another country's wildlife if neighboring countries continue using it. POPs are found in Arctic polar bears and Inuit populations despite no local industrial sources.
POPsDirty DozenGlobal DistillationUnit 8 Connection
Basel Convention
Basel Convention on Hazardous Wastes — 1989; entered into force 1992
Core purpose: Control the transboundary movements of hazardous wastes and their disposal; prevent "waste dumping" in developing nations with less stringent environmental regulations.
Key provisions: Parties must obtain prior informed consent from receiving country before shipping hazardous waste; prohibits export of hazardous waste to non-parties; requires environmentally sound management of hazardous waste. 2019 Basel Plastic Waste Amendment: extended controls to include plastic waste exports.
AP significance: E-waste (electronic waste) — much US e-waste is exported to developing nations (Ghana, Nigeria, India) where informal workers dismantle it under dangerous conditions without protection, contaminating their communities with lead, mercury, cadmium, and brominated flame retardants. Basel Convention is supposed to prevent this, but enforcement varies. Connects to Unit 8 solid waste topic.
Key provisions: Parties must obtain prior informed consent from receiving country before shipping hazardous waste; prohibits export of hazardous waste to non-parties; requires environmentally sound management of hazardous waste. 2019 Basel Plastic Waste Amendment: extended controls to include plastic waste exports.
AP significance: E-waste (electronic waste) — much US e-waste is exported to developing nations (Ghana, Nigeria, India) where informal workers dismantle it under dangerous conditions without protection, contaminating their communities with lead, mercury, cadmium, and brominated flame retardants. Basel Convention is supposed to prevent this, but enforcement varies. Connects to Unit 8 solid waste topic.
Hazardous Waste TradeE-WastePrior Informed ConsentUnit 8 Connection
Minamata Convention on Mercury
2013; entered into force 2017
Core purpose: Protect human health and the environment from anthropogenic emissions and releases of mercury and mercury compounds.
Key provisions: Bans new mercury mining; phases out specific products containing mercury (thermometers, batteries, some medical devices); controls mercury emissions from coal-fired power plants, cement plants, and waste incineration; requires environmentally sound storage of mercury waste.
Named for Minamata disease: The disease occurred in Minamata City, Japan beginning in 1956. Chisso Corporation discharged methylmercury into Minamata Bay for decades; mercury biomagnified through fish to local human populations causing severe neurological damage, birth defects, and death (thousands affected; hundreds died).
AP connection: Mercury biomagnification (Unit 8), coal combustion as primary mercury source (Unit 6), methylmercury toxicity (Unit 8), FDA fish consumption advisories.
Key provisions: Bans new mercury mining; phases out specific products containing mercury (thermometers, batteries, some medical devices); controls mercury emissions from coal-fired power plants, cement plants, and waste incineration; requires environmentally sound storage of mercury waste.
Named for Minamata disease: The disease occurred in Minamata City, Japan beginning in 1956. Chisso Corporation discharged methylmercury into Minamata Bay for decades; mercury biomagnified through fish to local human populations causing severe neurological damage, birth defects, and death (thousands affected; hundreds died).
AP connection: Mercury biomagnification (Unit 8), coal combustion as primary mercury source (Unit 6), methylmercury toxicity (Unit 8), FDA fish consumption advisories.
MercuryMinamata DiseaseCoal PlantsBiomagnification
Exam Prep
↔ High-Yield Side-by-Side Comparisons
The AP exam frequently asks you to compare two similar-sounding laws or treaties. Master these distinctions.
All Major US Environmental Laws — Master Quick Reference
| Law / Acronym | Year | What It Regulates | Key Mechanism | AP Exam Angle |
|---|---|---|---|---|
| Clean Air Act (CAA) | 1970/1990 | Air pollutants: 6 criteria pollutants + 189 HAPs; vehicle and stationary sources | NAAQS standards; NSPS; Title IV cap-and-trade for SO₂ | Which technology removes which pollutant; 1990 SO₂ cap-and-trade success; CO₂ requires different legislation |
| Clean Water Act (CWA) | 1972 | Discharges into US navigable waters; wetlands (Section 404) | NPDES permit system; water quality standards | Point vs. NPS distinction; Cuyahoga River; CWA ≠ SDWA; agricultural NPS still #1 problem |
| Safe Drinking Water Act (SDWA) | 1974 | Drinking water quality at the tap; public water systems | Maximum Contaminant Levels (MCLs) | CWA regulates IN waterways; SDWA regulates AT the tap. Flint lead crisis. |
| CAFE Standards | 1975 | Vehicle fuel economy; automakers' fleet average | Fleet-average mpg requirements; manufacturer penalties | Jevons Paradox; largest transportation emissions reduction tool; ≠ Clean Air Act vehicle standards |
| RCRA | 1976 | Active solid and hazardous waste generation, transport, treatment, storage, disposal | Cradle-to-grave tracking; manifest system; landfill standards | RCRA = active sites; CERCLA = abandoned sites. Banned open dumping. |
| FIFRA | 1947/1972 | Pesticide registration, use, sale, and labeling | EPA registration requirement; risk-benefit analysis; tolerance levels in food | DDT deregistered 1972; connects to Unit 5 pesticides; Rachel Carson / Silent Spring |
| TSCA | 1976/2016 | Industrial chemicals — testing, reporting, restrictions | Chemical review before commercialization; risk-based restrictions | PCB ban (1979); PFAS regulation; 2016 Lautenberg reform strengthened it |
| CERCLA / Superfund | 1980 | Cleanup of abandoned contaminated sites | National Priorities List; strict retroactive joint-and-several liability; Superfund Trust | Love Canal motivation; retroactive liability; "polluter pays"; RCRA ≠ CERCLA |
| Endangered Species Act (ESA) | 1973 | Listed threatened and endangered species and their habitats | Take prohibition (Sec 9); critical habitat (Sec 4); federal consultation (Sec 7); ITP (Sec 10) | Applies to private land; California condor; "take" definition; CITES ≠ ESA |
| NEPA | 1969/1970 | Federal agency decision-making process for projects with significant environmental impact | Environmental Impact Statement (EIS) requirement before major federal actions | Procedural only (doesn't prohibit actions); EIS ≠ permission; established CEQ (not EPA — EPA was created by Reorganization Plan No. 3, 1970) |
| Marine Mammal Protection Act | 1972 | Marine mammals in US waters and by US citizens internationally | Take prohibition; incidental take authorization for fisheries bycatch | Connects to Unit 5 overfishing bycatch; whale sonar; Unit 9 ocean warming |
| MPRSA (Ocean Dumping) | 1972 | Ocean dumping of waste materials | Prohibition on most ocean dumping; dredged material permit system | Connects to Unit 8 solid waste; historical ocean sewage sludge dumping |
All Major International Treaties — Master Quick Reference
| Treaty | Year | Focus | Parties / US Status | AP Exam Angle |
|---|---|---|---|---|
| Montreal Protocol | 1987 | Phase-out of ozone-depleting substances (CFCs, HCFCs, halons) | 197 parties; universal ratification | Only universally ratified UN treaty; CBDR principle; HFC problem → Kigali; full ozone recovery ~2065 |
| Kigali Amendment | 2016 | Phase-down of HFCs (CFC replacements that are potent GHGs) | ~150 parties; US ratified 2022 | Unintended consequence of Montreal: solved ozone but created GHG problem; GWP 1,000–23,500 |
| Kyoto Protocol | 1997 | Binding GHG reduction targets for developed (Annex I) nations only | 192 parties; US never ratified | US never ratified; developing nations (China, India) excluded; limited effectiveness; important precedent |
| Paris Agreement | 2015 | Hold warming to well below 2°C (preferably 1.5°C); voluntary NDCs from all nations | 196 parties; US rejoined 2021; withdrew (effective January 2026) | Voluntary NDCs (no enforcement); current pledges insufficient for 1.5°C; CBDR; NDCs submitted every 5 years |
| CITES | 1973 | International trade in endangered species; permit system for wildlife trade | ~185 parties (as of 2025); US is party | Appendix I = no commercial trade; Appendix II = regulated trade; domestic trade NOT covered; ivory ban |
| Convention on Biological Diversity (CBD) | 1992 | Biodiversity conservation; sustainable use; benefit-sharing from genetic resources | 196 parties; US signed but NOT ratified | US not a party; "30x30" Kunming-Montreal 2022 target; Nagoya Protocol on bioprospecting |
| UNCLOS | 1982 | Ocean governance; territorial waters; EEZs; deep-sea resources | 168 parties; US NOT ratified | 200nm EEZ; fisheries rights; deep-sea mining; US complies as customary law; Unit 5 fisheries |
| Stockholm Convention on POPs | 2001 | Phase-out and restriction of Persistent Organic Pollutants | 184 parties; US signed but not ratified (TSCA handles domestically) | Dirty Dozen; global distillation explains why international action needed; PFOA/PFOS added 2019 |
| Basel Convention | 1989 | Control of transboundary hazardous waste trade and disposal | ~186 parties (as of 2025); US signed but NOT ratified | E-waste to developing nations; prior informed consent; plastic waste amendment 2019 |
| Minamata Convention on Mercury | 2013 | Reduce anthropogenic mercury emissions and releases | 147 parties; US is party | Named for Minamata disease (Japan); coal plant emissions; biomagnification; FDA fish advisories |
Exam Prep
⚠ Top Common Mistakes — Policies & Laws
- 🌍CWA ≠ SDWA: two completely different laws at two different points in the water cycleThe Clean Water Act regulates pollutant discharges INTO waterways (preventing contamination at the source). The Safe Drinking Water Act regulates drinking water quality AT THE TAP (treating water for human consumption). A factory discharging into a river violates the CWA. A water utility providing contaminated tap water violates the SDWA. Never conflate them.
- ♄RCRA ≠ CERCLA/Superfund: active sites vs. abandoned sitesRCRA = ongoing, active waste generation and disposal at currently operating facilities (cradle-to-grave tracking, standards for active landfills). CERCLA/Superfund = abandoned, uncontrolled contaminated sites with no active operator (Love Canal model). This is one of the most-tested distinctions in US environmental law.
- ⛭ESA applies to PRIVATE land, not just federal/public landSection 9's "take" prohibition applies to any person on any land regardless of ownership. A private landowner developing their own property can be prosecuted for harming or significantly modifying habitat of a listed species. Incidental Take Permits (ITPs) with Habitat Conservation Plans (HCPs) provide a legal development pathway, but the default rule is that take is prohibited everywhere.
- 🌍Scrubbers remove SO₂ but NOT CO₂ — solving acid rain ≠ solving climate changeCoal plant scrubbers (FGD) are highly effective at removing SO₂ from flue gas, dramatically reducing acid rain. CO₂ passes through scrubbers entirely. A coal plant with perfect scrubbers still emits full CO₂. Addressing CO₂ requires either fuel switching (renewable energy) or Carbon Capture and Storage (CCS) — which is not yet commercially deployed at scale. "Clean coal" with scrubbers = clean of SO₂ only.
- ⚡NEPA is a procedural law — it does NOT prohibit environmentally harmful federal actionsNEPA requires federal agencies to assess and disclose environmental impacts through an EIS before taking major actions. However, after completing the EIS, the agency can still choose the most damaging option. NEPA guarantees process (consideration + disclosure), not outcomes (protection). An EIS is not the same as permission or prohibition.
- 🌿CITES Appendix I bans COMMERCIAL trade, not all trade — and only covers INTERNATIONAL tradeAppendix I bans commercial trade. Non-commercial trade (scientific research exchanges, zoo captive breeding programs) may be permitted with documentation. More importantly, CITES does not regulate domestic trade within a country — only international trade across borders. A country can have a legal domestic ivory market from pre-ban stockpiles; CITES only governs import and export.
- 🌎The US has NOT ratified CBD, UNCLOS, or Basel Convention — critical AP trapStudents often assume the US has joined all major international environmental agreements. Key distinctions: US IS a party to: CITES (1975), Montreal Protocol (1988), Minamata Convention (2013), Paris Agreement (rejoined 2021; withdrew effective January 2026). US signed but never ratified Kyoto Protocol — never a party. US is NOT a party to: CBD, UNCLOS, Basel Convention, Stockholm Convention (though it substantially complies with each as customary international law or through domestic regulation).
- 🔥HFCs replaced CFCs and solved the ozone problem but are POWERFUL greenhouse gases (GWP 1,000–23,500)The Montreal Protocol successfully phased out CFCs by replacing them with HFCs. This fixed ozone depletion. But HFCs are 1,000–23,500 times more potent than CO₂ as greenhouse gases, creating an unintended climate problem. The 2016 Kigali Amendment addresses this by phasing down HFCs. This is a cautionary tale about solving one environmental problem by inadvertently creating another.
- ☁CAA regulates the 6 CRITERIA pollutants AND 189 HAPs — CO₂ was NOT originally a criteria pollutantThe original 1970 CAA regulated the six criteria pollutants. CO₂ is NOT a criteria pollutant and was not regulated under CAA until Massachusetts v. EPA (2007 Supreme Court ruling) held that EPA must regulate CO₂ as a pollutant under the CAA if it "endangers" public health or welfare. EPA issued the 2009 Endangerment Finding. But climate-focused CO₂ regulation still differs fundamentally from criteria pollutant regulation.
- ☠FIFRA regulates PESTICIDE USE and REGISTRATION — it is different from TSCA (general chemicals) and RCRA (disposal)FIFRA: regulates pesticides — requires EPA registration before sale; risk-benefit analysis; tolerance levels in food. TSCA: regulates industrial chemicals generally — testing, reporting, restrictions on hazardous chemicals (PCBs, PFAS). RCRA: regulates disposal of solid and hazardous waste (including pesticide waste). Three different laws for three different aspects of chemical governance.
Exam Strategy
★ Policy & Law Exam Strategy
14
US Federal Laws
10
Intl. Treaties
~15%
Policy-Related MCQs
1–2
FRQ Parts on Policy
How AP Exams Test Policy & Law
MCQ Pattern 1 — "Which law addresses X?"
Given a scenario (oil spill, air quality problem, endangered species), identify which law applies. Example: "A factory is discharging mercury-laden wastewater into a river without a permit. Which law is MOST directly violated?" (Clean Water Act — NPDES permit required for point source discharges.)
MCQ Pattern 2 — "Which technology/mechanism is required by law?"
Example: "A coal-fired power plant is required to install scrubbers under which law?" (Clean Air Act). Or: "A new federal highway is proposed through a wetland. What process must occur first?" (NEPA Environmental Impact Statement AND CWA Section 404 wetland permit.)
MCQ Pattern 3 — Distinguish similar laws
These are the most-tested policy questions: CWA vs. SDWA; RCRA vs. CERCLA; ESA national vs. CITES international; Montreal vs. Kyoto vs. Paris. Know the key distinguishing features of each pair cold.
FRQ Pattern — Explain a policy mechanism
FRQ parts often ask you to: (1) Identify a specific law that applies to a scenario and its relevant provision; (2) Explain HOW the mechanism works (e.g., cap-and-trade for SO₂ under CAA 1990); (3) Explain WHY one policy approach succeeded and another failed (Montreal Protocol vs. Kyoto/Paris); (4) Propose a policy solution with justification.
The "3 Pairs" Most Likely to Appear on AP Exam
| Pair | Key Distinction | Memory Tip |
|---|---|---|
| CWA vs. SDWA | CWA = what goes INTO the water. SDWA = what comes OUT of your tap. | CWA = Clean the waterways. SDWA = Safe to drink. |
| RCRA vs. CERCLA | RCRA = active, ongoing waste facilities (current operators). CERCLA = abandoned contaminated sites (cleanup of the past). | RCRA = Running (active). CERCLA = Closed (abandoned). |
| CITES vs. ESA | CITES = international trade in wildlife across borders. ESA = protection of listed species within the US (public AND private land). | CITES = Cross borders. ESA = Every acre of US soil. |
| Montreal vs. Paris | Montreal = binding phase-out schedule; universally ratified; CFCs only; substitutes available; succeeded. Paris = voluntary NDCs; no enforcement; all GHGs; requires transforming entire energy system; insufficient pledges. | Montreal = Mission accomplished (mostly). Paris = Promise pending. |
| NEPA vs. substantive laws | NEPA = procedural only (must assess and disclose impacts; doesn't prohibit actions). CAA, CWA, ESA = substantive (set enforceable standards and prohibitions). | NEPA = Notice and report. Other laws = No and restrict. |
| CAA vs. CAFE Standards | CAA = emission limits per vehicle (tailpipe standards) and for stationary sources. CAFE = fuel economy standard for automakers' fleet average. Both reduce vehicle emissions but through different mechanisms. | CAA = Clean emissions from the car. CAFE = Corporate fuel efficiency requirement. |
Final Policy Strategy Note
On AP FRQs, when asked to propose a policy solution, name a specific law or treaty and explain its mechanism — vague answers like "the government should regulate pollution" earn no credit. Instead: "The Clean Air Act's cap-and-trade mechanism (used successfully for SO₂ under the 1990 Acid Rain Program) could be applied to CO₂ by setting a declining annual cap on emissions and allowing polluters to buy and sell permits, creating a market incentive for cost-effective reductions." The FRQ scoring guides reward specific, mechanistic policy explanations.
Also remember: FRQs that ask for "a law or policy" that addresses a problem accept either domestic (CAA, CWA, ESA) or international (Montreal Protocol, Paris Agreement, CITES) examples — choose the one you can most fully explain.