Civil Law and U.S. Environmental Law

1. Introduction

U.S. environmental law is a broad body of federal and state law governing the protection of air, water, land, ecosystems, wildlife, natural resources, and public health.

Unlike a traditional civil-law system in which environmental liability may be organized primarily around a general civil code, the United States relies heavily on specialized federal statutes, administrative regulation, common-law doctrines, and state environmental laws.

Important federal environmental statutes include:

National Environmental Policy Act (NEPA)

Clean Air Act (CAA)

Clean Water Act (CWA)

Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA)

Resource Conservation and Recovery Act (RCRA)

Endangered Species Act (ESA)

National Forest Management Act

Marine Mammal Protection Act

Toxic Substances Control Act (TSCA)

Environmental disputes can have both public-law and private-law dimensions.

From the civil-law perspective, important questions include:

Who is liable for environmental harm?

What constitutes environmental damage?

Can an injured person sue a polluter?

Can a court order restoration?

Can several polluters be held responsible?

How are cleanup costs allocated?

When can citizens enforce environmental statutes?

How should courts address future environmental harm?

What remedies are available for ecological injury?

2. Objectives of U.S. Environmental Law

The major objectives include:

A. Protection of human health

Environmental law seeks to reduce exposure to:

toxic chemicals;

polluted air;

contaminated water;

hazardous waste;

radiation;

dangerous substances.

B. Protection of ecosystems

It protects:

forests;

wetlands;

rivers;

oceans;

wildlife;

endangered species;

habitats.

C. Pollution control

Federal laws regulate:

air pollution;

water pollution;

hazardous substances;

waste disposal;

toxic chemicals.

D. Prevention

Environmental law increasingly emphasizes preventing environmental damage rather than simply compensating victims after harm occurs.

E. Restoration

Where environmental harm has already occurred, law can require:

cleanup;

restoration;

remediation;

compensation.

3. Environmental Law and Civil Law

Environmental disputes may involve traditional civil-law doctrines such as:

negligence;

nuisance;

trespass;

strict liability;

property damage;

personal injury;

products liability;

unjust enrichment;

restitution;

equitable relief.

For example, a factory that releases toxic substances may potentially face:

Regulatory liability + statutory liability + tort liability + contractual liability + property liability.

Thus, environmental law often operates alongside traditional private law.

4. Public Law and Private Law

U.S. environmental law has two major dimensions.

Public environmental law

Government agencies enforce environmental statutes.

Examples include:

Environmental Protection Agency enforcement;

Department of Justice litigation;

state environmental agency enforcement.

Private environmental law

Private parties may bring:

tort actions;

property claims;

statutory citizen suits;

contract claims;

insurance disputes;

contribution actions.

The interaction between the two systems is a defining feature of American environmental law.

5. National Environmental Policy Act (NEPA)

NEPA is primarily a procedural environmental statute.

It requires federal agencies to consider environmental consequences when undertaking certain major federal actions.

The Environmental Impact Statement process can require analysis of:

environmental effects;

alternatives;

irreversible commitments;

ecological consequences;

public impacts.

NEPA generally does not operate as a conventional private damages statute.

Its principal importance is ensuring environmental decision-making and disclosure.

6. Clean Air Act

The Clean Air Act regulates air pollution.

It addresses:

national ambient air quality;

hazardous air pollutants;

industrial emissions;

vehicle emissions;

greenhouse-gas-related regulatory issues.

The federal government and states play important enforcement roles.

Environmental organizations and other parties may also have litigation rights where statutory requirements are satisfied.

7. Clean Water Act

The Clean Water Act regulates discharges of pollutants into waters covered by the statute.

Major mechanisms include:

National Pollutant Discharge Elimination System (NPDES);

permitting;

water-quality standards;

enforcement actions;

citizen suits.

Important disputes often concern whether a particular discharge falls within the statute's jurisdiction.

8. CERCLA

The Comprehensive Environmental Response, Compensation, and Liability Act, commonly known as Superfund, addresses hazardous-substance contamination.

CERCLA provides mechanisms for:

investigation;

cleanup;

recovery of response costs;

allocation of responsibility;

contribution among potentially responsible parties.

Potentially responsible parties can include:

current owners;

current operators;

certain former owners and operators;

arrangers;

transporters.

CERCLA liability can be particularly important where contamination has occurred over many years and identifying the precise source of every portion of pollution is difficult.

9. RCRA

The Resource Conservation and Recovery Act regulates the treatment, storage, and disposal of hazardous waste.

It is principally concerned with management of hazardous waste rather than simply cleaning up historical contamination.

RCRA can also support citizen suits under specified circumstances.

10. Endangered Species Act

The ESA protects threatened and endangered species and their habitats.

It can restrict actions that:

unlawfully harm protected species;

destroy protected habitat;

interfere with conservation requirements.

The statute has generated significant litigation concerning the balance between:

economic development and species protection.

11. Environmental Standing

Standing is a major issue in U.S. environmental litigation.

A plaintiff generally must establish an appropriate injury that is:

concrete;

particularized;

actual or sufficiently imminent;

and that is sufficiently connected to the defendant's conduct and capable of judicial redress.

Environmental plaintiffs frequently rely upon:

recreational injury;

aesthetic injury;

use of natural resources;

property injury;

health-related injury where legally cognizable.

12. Lujan v. Defenders of Wildlife (1992)

504 U.S. 555 (1992)

Facts

Environmental organizations challenged federal agency action concerning protection of endangered species abroad.

Principle

The Supreme Court established important requirements for Article III standing.

The plaintiff must demonstrate an actual or imminent injury rather than merely a generalized interest in government compliance with environmental law.

Importance

The case is foundational for environmental litigation because it explains:

injury in fact;

causation;

redressability.

Civil-law significance

Environmental plaintiffs cannot rely solely upon a general interest in environmental protection; they must establish the constitutional requirements for federal judicial standing.

13. Massachusetts v. EPA (2007)

549 U.S. 497 (2007)

Facts

Massachusetts and other petitioners challenged the Environmental Protection Agency's refusal to regulate greenhouse gases from motor vehicles under the Clean Air Act.

Principle

The Supreme Court recognized Massachusetts' standing and held that greenhouse gases could fall within the Clean Air Act's statutory definition of air pollutants.

Importance

The case is one of the most important U.S. environmental decisions concerning:

climate change;

standing;

administrative law;

Clean Air Act regulation.

Civil-law significance

It demonstrates how environmental litigation can use judicial review to compel consideration of environmental risks.

14. Friends of the Earth, Inc. v. Laidlaw Environmental Services, Inc. (2000)

528 U.S. 167 (2000)

Facts

Laidlaw operated a facility accused of discharging pollutants in violation of its Clean Water Act permit.

Environmental organizations brought a citizen suit.

Principle

The Supreme Court recognized that environmental plaintiffs can suffer legally cognizable recreational and aesthetic injuries.

Importance

The case is especially important for:

environmental standing;

citizen suits;

water pollution;

injunctive relief.

Civil-law significance

It demonstrates that environmental injury need not always be purely economic or involve physical injury to the plaintiff.

Loss of lawful use and enjoyment of environmental resources can constitute a relevant injury.

15. Massachusetts v. United States Environmental Protection Agency

The climate-change litigation associated with Massachusetts v. EPA also illustrates the special role of states as litigants.

States may have distinctive interests in protecting:

state territory;

natural resources;

public infrastructure;

coastal land;

environmental resources.

The case therefore illustrates the interaction between federal environmental regulation and state interests.

16. Sierra Club v. Morton (1972)

405 U.S. 727 (1972)

Facts

The Sierra Club challenged development of a recreational project in the Mineral King Valley.

Principle

The Supreme Court held that an organization cannot establish standing merely by asserting a generalized interest in environmental preservation.

However, the decision recognized that members could potentially establish standing through appropriate allegations concerning their own use and enjoyment of affected areas.

Importance

The case is a foundational environmental-standing decision.

Civil-law significance

It emphasizes the difference between:

general environmental concern and legally cognizable personal injury.

17. Tennessee Valley Authority v. Hill (1978)

437 U.S. 153 (1978)

Facts

The Tennessee Valley Authority was constructing the Tellico Dam, which threatened the habitat of the endangered snail darter.

Principle

The Supreme Court interpreted the Endangered Species Act strictly and required compliance with its protective provisions despite substantial economic investment in the project.

Importance

The case demonstrates the powerful protective effect of environmental legislation.

Civil-law significance

It illustrates the willingness of courts to grant strong equitable relief where statutory environmental protections are threatened.

18. Rapanos v. United States (2006)

547 U.S. 715 (2006)

Facts

The case involved the scope of federal jurisdiction under the Clean Water Act over wetlands.

Principle

The Supreme Court produced multiple opinions concerning the meaning of waters subject to federal regulation.

Importance

Rapanos is a major authority on:

wetlands;

federal environmental jurisdiction;

Clean Water Act coverage;

statutory interpretation.

Civil-law significance

It illustrates how the legal classification of land and water can determine the existence of regulatory liability.

19. County of Maui v. Hawaii Wildlife Fund (2020)

590 U.S. 165 (2020)

Facts

A wastewater treatment facility discharged treated wastewater into groundwater that eventually reached the ocean.

Legal issue

Whether the discharge required a Clean Water Act permit even though the pollutants traveled through groundwater before reaching navigable waters.

Principle

The Supreme Court adopted an approach asking whether the discharge is the functional equivalent of a direct discharge into covered waters.

Importance

The case is highly important for:

groundwater;

wastewater;

indirect pollution;

Clean Water Act permitting.

Civil-law significance

It demonstrates how courts analyze causation and physical pathways when determining environmental responsibility.

20. Sackett v. Environmental Protection Agency (2023)

598 U.S. 651 (2023)

Facts

The Sackett family sought to develop property near Priest Lake in Idaho.

The dispute concerned whether wetlands on their property were subject to federal Clean Water Act jurisdiction.

Principle

The Supreme Court adopted a narrower approach to the scope of "waters of the United States" for purposes of the Clean Water Act.

Importance

The case is significant for:

wetlands regulation;

property rights;

federal regulatory authority;

Clean Water Act jurisdiction.

Civil-law significance

It demonstrates the tension between:

private property rights and environmental regulation.

21. Burlington Northern & Santa Fe Railway Co. v. United States (2009)

556 U.S. 599 (2009)

Facts

The case concerned contamination involving hazardous chemicals and liability under CERCLA.

Principle

The Supreme Court addressed:

arranger liability;

intent;

divisibility of harm.

The Court held that arranger liability requires consideration of whether the defendant intended to dispose of the hazardous substance.

It also recognized that a defendant may avoid joint-and-several liability where environmental harm is reasonably capable of division.

Importance

This is one of the leading CERCLA decisions.

Civil-law significance

It illustrates how causation, responsibility, and allocation of damages operate in environmental contamination cases.

22. United States v. Bestfoods (1998)

524 U.S. 51 (1998)

Facts

The case involved environmental contamination at industrial facilities owned or operated through corporate structures.

Principle

The Supreme Court considered when a parent corporation could be held liable under CERCLA for the activities of a subsidiary.

Corporate ownership alone does not automatically make the parent an operator of the subsidiary's facility.

Importance

The case is essential for:

corporate liability;

parent-subsidiary relationships;

CERCLA;

environmental responsibility.

Civil-law significance

It demonstrates the importance of separate corporate personality in determining environmental liability.

23. Key CERCLA Principles

CERCLA litigation commonly involves:

Current owners

Current ownership can create liability subject to statutory defenses.

Former owners

Former owners can potentially be liable under specified statutory circumstances.

Operators

Persons operating contaminated facilities can potentially face liability.

Arrangers

Entities that arrange for disposal or treatment of hazardous substances may face liability.

Transporters

Certain persons who accept hazardous substances for transport and select disposal sites may face liability.

24. Joint and Several Liability

Environmental contamination can involve multiple polluters.

The question then becomes:

Should each defendant be responsible for the entire cleanup cost or only its share?

Under CERCLA principles, joint-and-several liability can apply where harm is indivisible.

However, Burlington Northern recognized the importance of divisibility.

If harm can reasonably be apportioned, a defendant may be able to establish a basis for avoiding responsibility for portions of harm attributable to others.

25. Environmental Nuisance

Traditional nuisance law can play an important role in environmental disputes.

A private nuisance generally concerns substantial and unreasonable interference with the use or enjoyment of land.

Examples include:

toxic odors;

smoke;

industrial noise;

chemical contamination;

water pollution.

A public nuisance may involve interference with rights common to the public.

Environmental plaintiffs may seek:

damages;

injunctions;

abatement.

26. Environmental Negligence

A pollution-related negligence claim may require proof of:

duty;

breach;

causation;

legally recognized injury.

Examples include:

negligent chemical storage;

negligent waste disposal;

failure to maintain containment systems;

negligent release of pollutants.

However, federal environmental statutes may impose obligations independent of traditional negligence.

27. Strict Liability

Certain environmental statutes can impose liability without requiring traditional proof of negligence.

CERCLA is particularly significant because liability can arise from statutory categories of responsibility rather than ordinary negligence principles.

Strict liability is especially important because environmental contamination can be:

complex;

long-lasting;

difficult to trace;

caused by multiple parties.

28. Citizen Suits

Several major federal environmental statutes contain citizen-suit provisions.

Citizen suits allow qualifying private parties to seek judicial enforcement in specified circumstances.

They can serve as an important supplement to government enforcement.

However, statutory prerequisites often apply, including:

standing;

notice;

absence of certain parallel enforcement circumstances;

compliance with statutory procedures.

29. Environmental Injunctions

Environmental law frequently uses injunctions because damages alone may not adequately remedy ecological harm.

A court may order:

cessation of pollution;

compliance with permits;

restoration;

environmental mitigation;

protection of endangered species;

prevention of threatened harm.

Tennessee Valley Authority v. Hill demonstrates the potential significance of equitable relief in environmental cases.

30. Environmental Damages

Environmental damages can include:

Personal injury

Where pollution causes legally compensable physical injury.

Property damage

Loss or diminution in property value.

Cleanup costs

Expenses necessary to remove or remediate contamination.

Economic losses

Business interruption or other qualifying losses.

Natural-resource damages

Compensation for injury to natural resources under applicable statutory frameworks.

Restoration costs

Costs necessary to restore damaged environmental resources.

31. Environmental Contamination and Causation

Causation is often one of the most difficult issues.

A plaintiff may need to demonstrate:

Pollutant → pathway → exposure → injury.

In contamination cases, multiple potential sources may exist.

Scientific evidence may be necessary concerning:

chemical signatures;

groundwater movement;

air dispersion;

toxicology;

epidemiology;

historical operations.

32. Corporate Environmental Liability

Corporations can face environmental claims arising from:

manufacturing;

transportation;

waste disposal;

energy production;

mining;

chemical operations.

Corporate groups create additional questions:

Which entity owned the facility?

Which entity operated it?

Who controlled environmental decisions?

Who arranged disposal?

Who transported the material?

United States v. Bestfoods demonstrates why corporate separateness and operational control matter.

33. Environmental Law and Property Rights

Environmental regulation can significantly affect private property.

Examples include:

wetlands restrictions;

endangered-species protections;

zoning;

conservation restrictions;

contaminated-property obligations.

This can create constitutional disputes involving:

takings;

due process;

regulatory authority.

The central question can be:

When does environmental regulation become an unconstitutional taking of private property?

34. Lucas v. South Carolina Coastal Council (1992)

505 U.S. 1003 (1992)

Facts

David Lucas purchased coastal property intending to build homes. South Carolina subsequently enacted restrictions that prevented the proposed development.

Principle

The Supreme Court held that regulation depriving property of all economically beneficial use can constitute a categorical taking, subject to the background principles of state property and nuisance law.

Importance

Lucas is a leading authority concerning:

environmental regulation;

property rights;

regulatory takings;

coastal protection.

Civil-law significance

It demonstrates the constitutional boundary between environmental regulation and private property rights.

35. Pennsylvania Coal Co. v. Mahon (1922)

260 U.S. 393 (1922)

Principle

Justice Holmes famously recognized that while property regulation is permissible, regulation can go "too far" and constitute a taking.

Environmental significance

Although not originally an environmental case, it became foundational to modern regulatory-takings jurisprudence involving land-use and environmental regulation.

36. Climate Change and U.S. Environmental Law

Climate change has created new legal questions involving:

greenhouse gases;

federal regulatory authority;

state climate regulation;

corporate responsibility;

public nuisance;

insurance;

infrastructure;

adaptation.

Massachusetts v. EPA is a central federal authority.

Climate-related civil claims can also involve state tort law, although federal preemption, displacement, causation, standing, and political-question arguments may arise.

37. Public Nuisance and Climate Litigation

Climate-related plaintiffs have sometimes relied upon nuisance theories.

Typical allegations concern:

greenhouse-gas emissions;

sea-level rise;

environmental degradation;

infrastructure damage.

However, federal courts have frequently confronted questions concerning:

federal displacement;

separation of powers;

political questions;

standing;

causation.

Climate litigation therefore illustrates the difficulty of using traditional civil doctrines to address global environmental phenomena.

38. American Electric Power Co. v. Connecticut (2011)

564 U.S. 410 (2011)

Facts

Several states and private parties sued major electric utilities, alleging that greenhouse-gas emissions constituted a public nuisance.

Principle

The Supreme Court concluded that federal common-law nuisance claims seeking regulation of greenhouse-gas emissions were displaced by the Clean Air Act's regulatory framework.

Importance

The case is important for:

climate litigation;

federal common law;

public nuisance;

statutory displacement;

separation of judicial and regulatory functions.

Civil-law significance

It demonstrates that traditional tort remedies may be limited where Congress has established a comprehensive federal regulatory framework.

39. Environmental Federalism

U.S. environmental law operates through both federal and state governments.

Federal laws establish nationwide standards while states often administer programs or impose additional requirements.

This creates questions involving:

federal preemption;

state regulatory authority;

cooperative federalism;

state environmental torts.

Environmental disputes can therefore involve several overlapping legal regimes.

40. Administrative Law and Environmental Law

Environmental agencies exercise substantial regulatory authority.

Courts may review:

agency rules;

permits;

environmental impact analyses;

enforcement decisions;

regulatory interpretations.

Environmental litigation therefore frequently combines:

environmental law + administrative law + constitutional law.

41. Environmental Impact Assessment

Under NEPA, federal agencies may be required to examine environmental consequences of major federal actions.

An environmental review can consider:

direct effects;

indirect effects;

cumulative effects;

alternatives;

mitigation.

The purpose is principally informed decision-making rather than automatic prohibition of environmentally harmful projects.

42. Hazardous Waste

Hazardous-waste law addresses:

generation;

transportation;

storage;

treatment;

disposal.

RCRA focuses substantially on ongoing management, while CERCLA is particularly important for cleanup of contaminated sites.

The two statutes can therefore operate together.

43. Environmental Insurance Disputes

Environmental contamination can generate disputes between:

insured companies;

insurers;

reinsurers;

property owners.

Issues include:

occurrence;

pollution exclusions;

notice;

allocation;

defense costs;

indemnity.

These disputes demonstrate the interaction between environmental law and insurance law.

44. Environmental Evidence

Environmental cases frequently depend on expert evidence.

Experts may address:

toxicology;

epidemiology;

geology;

hydrology;

atmospheric science;

engineering;

ecology;

economics.

Evidence may be used to establish:

contamination;

source;

exposure;

causation;

damages;

divisibility.

45. Defences in Environmental Litigation

Common defenses include:

1. No causation

The defendant did not cause the alleged injury.

2. Divisibility

The defendant's contribution can be separated from the overall contamination.

3. Statutory defenses

Applicable environmental statutes may contain specific defenses.

4. Permit defense or authorization arguments

The defendant may rely upon the scope and terms of a permit, although regulatory authorization does not necessarily eliminate all liability.

5. Statute of limitations

The claim may be time-barred.

6. Lack of standing

The plaintiff cannot demonstrate a sufficient injury.

7. Preemption or displacement

Federal law may displace particular state or federal common-law claims.

8. Regulatory compliance

The defendant may argue that it complied with applicable regulatory requirements, although compliance does not automatically defeat every private-law claim.

46. Relationship Between Environmental Statutes and Tort Law

Environmental statutes do not necessarily eliminate traditional tort claims.

A single incident can potentially produce:

CERCLA claim + negligence claim + nuisance claim + trespass claim + property-damage claim.

However, courts must determine whether a statutory framework:

preempts;

displaces;

supplements; or

coexists with

the common-law claim.

American Electric Power demonstrates the importance of this question.

47. Environmental Justice

Environmental law increasingly considers whether environmental burdens are disproportionately imposed upon particular communities.

Issues include:

industrial pollution;

hazardous waste;

air quality;

drinking water;

cumulative exposure.

Environmental justice can influence:

regulatory policy;

permitting;

enforcement;

community litigation.

48. Environmental Law and Indigenous Interests

Environmental disputes can also involve Indigenous and tribal interests concerning:

land;

water;

cultural resources;

wildlife;

natural resources.

Federal Indian law, treaty rights, environmental law, and property law can overlap.

49. Environmental Law and Energy

Energy projects frequently generate environmental litigation.

Examples include:

oil and gas development;

pipelines;

coal mining;

nuclear facilities;

renewable-energy projects;

transmission infrastructure.

Legal disputes can concern:

permits;

emissions;

land use;

water;

wildlife;

environmental review.

50. Major Case-Law Summary

51. Important Principles from the Cases

The cases collectively establish several major principles.

Principle 1: Environmental concern alone is insufficient

Sierra Club v. Morton and Lujan establish important standing requirements.

Principle 2: Environmental use can constitute injury

Laidlaw recognizes recreational and aesthetic injuries in appropriate circumstances.

Principle 3: Environmental statutes can require strong judicial remedies

TVA v. Hill demonstrates the potential importance of injunctions.

Principle 4: Environmental regulation can affect constitutional property rights

Lucas illustrates the takings boundary.

Principle 5: Federal environmental statutes can displace common-law remedies

American Electric Power demonstrates this principle in climate litigation.

Principle 6: Environmental liability can involve complex causation and allocation

Burlington Northern is central to divisibility and arranger liability.

Principle 7: Federal environmental jurisdiction has statutory limits

Rapanos and Sackett demonstrate the importance of statutory definitions.

Principle 8: Environmental pollution pathways matter

County of Maui demonstrates that indirect discharges may fall within federal regulation depending on their relationship to covered waters.

52. Civil Remedies in U.S. Environmental Law

The principal civil remedies include:

A. Damages

Compensation for qualifying:

personal injury;

property damage;

economic loss;

environmental harm.

B. Injunctions

Orders preventing continuing or threatened violations.

C. Cleanup and remediation

Particularly important under CERCLA and related laws.

D. Restoration

Returning damaged environmental resources toward their prior condition.

E. Contribution

Allocation of environmental cleanup responsibility among responsible parties.

F. Declaratory relief

Determining parties' legal obligations.

G. Civil penalties

Government enforcement may seek statutory civil penalties.

53. Environmental Class Actions

Environmental contamination can affect large populations.

Potential class actions may involve:

contaminated drinking water;

toxic exposure;

property contamination;

industrial pollution.

However, class certification can be difficult because individual plaintiffs may have different:

exposures;

injuries;

causation;

damages.

Courts must therefore carefully examine the procedural requirements for collective litigation.

54. Environmental Law and Corporate Responsibility

Modern environmental law increasingly focuses on corporate conduct.

Businesses may need to address:

environmental compliance;

hazardous waste;

emissions;

water pollution;

environmental disclosure;

supply-chain risks;

climate-related risks.

Corporate officers and directors may also face governance questions concerning environmental risks, although the precise scope of personal liability depends upon the applicable law.

55. Environmental Compliance and Due Diligence

Businesses acquiring property should investigate:

historical contamination;

hazardous substances;

underground storage tanks;

environmental permits;

groundwater conditions;

regulatory notices.

Environmental due diligence is important because acquisition of contaminated property can potentially create substantial liabilities.

56. Civil-Law Analysis of an Environmental Dispute

A lawyer analyzing an environmental dispute should ask:

What environmental resource was harmed?

What pollutant or hazardous substance was involved?

Who caused or contributed to the harm?

Which federal statute applies?

Which state law applies?

Is there a private cause of action?

Does the plaintiff have standing?

Can causation be established?

Is the harm divisible?

Are multiple defendants responsible?

What damages are available?

Is an injunction appropriate?

Is cleanup required?

Are property rights implicated?

Is the claim preempted or displaced?

What expert evidence is necessary?

Are there insurance issues?

What limitation periods apply?

57. U.S. Environmental Law Compared with Traditional Civil Law

58. Emerging Environmental Issues

U.S. environmental law increasingly addresses:

Climate change

Greenhouse gases, adaptation, and climate-related litigation.

PFAS contamination

Persistent chemicals affecting water and human health.

Environmental justice

Distribution of environmental risks among communities.

Microplastics

Emerging concerns concerning water and ecosystems.

Biodiversity

Protection of ecosystems and species.

Renewable energy

Environmental impacts of solar, wind, hydroelectric, and transmission infrastructure.

Carbon capture

Regulation of carbon-storage infrastructure and environmental risks.

Artificial intelligence

AI can be used for environmental monitoring, but also creates questions concerning energy consumption, data centers, and resource use.

59. Conclusion

U.S. environmental law is a complex combination of statutory law, administrative regulation, constitutional law, common-law tort principles, property law, and civil remedies.

Its principal federal statutes include NEPA, the Clean Air Act, the Clean Water Act, CERCLA, RCRA, and the Endangered Species Act.

The leading cases demonstrate the breadth of the field:

Sierra Club v. Morton and Lujan establish important principles concerning standing.

Friends of the Earth v. Laidlaw recognizes appropriate recreational and aesthetic environmental injuries.

TVA v. Hill demonstrates the power of environmental statutory protections and equitable remedies.

Massachusetts v. EPA is fundamental to climate-change regulation.

Rapanos and Sackett address federal jurisdiction over wetlands and waters.

Burlington Northern addresses CERCLA arranger liability and divisibility.

United States v. Bestfoods examines corporate responsibility for contaminated facilities.

American Electric Power addresses the relationship between environmental statutes and common-law nuisance.

County of Maui addresses indirect pollutant discharges.

From a civil-law perspective, the most important feature of U.S. environmental law is that environmental harm can generate several overlapping forms of responsibility: statutory liability, tort liability, property liability, cleanup obligations, contribution claims, and equitable remedies.

The fundamental challenge is to balance environmental protection, public health, ecological preservation, economic development, corporate responsibility, and private property rights while ensuring that environmental decisions remain within the authority granted by Congress and the Constitution.