Courts should limit governments’ authority to regulate greenhouse-gas emissions

What's this about?

People disagree about whether courts should limit the power of governments to cut heat-trapping gas.

The key issue is when rules break the law, harm rights, or skip key steps.

What supporters say

• Courts can make sure agencies follow limits set by law and by the nation’s basic rules.
• Courts can protect public choice by stopping judges from making big plans that elected leaders should make.
• Courts can check if agencies explain their science, costs, and choices in a clear way.

What critics say

• Courts can make sure governments meet basic rights and duties, including duties to guard people from climate harm.
• Lawsuits can push governments and firms to change harmful acts.
• Court limits could block climate steps that the law already requires.
• Less action on heat-trapping gas could leave people to pay large health and climate costs.

How to read this

The number of points on each side does not show who is right; strong proof matters more than a long list.

The bottom line

The evidence supports narrow court limits, not broad blocks on climate action. Courts should stop illegal acts, while letting governments take lawful steps against climate harm.

The claim is not that courts should block climate regulation altogether. It is that judges should restrain governments when emissions rules exceed legal authority, violate protected rights or bypass required procedures—while allowing lawful action against climate risks.

The case for

Judicial limits can protect the boundaries set by constitutions and legislatures. In *West Virginia v. EPA*, the U.S. Supreme Court ruled that the Clean Air Act did not clearly authorize the Environmental Protection Agency’s plan to shift electricity generation from coal to other sources. The decision supports limits when an agency claims power to make major policy choices without clear approval from Congress. 1

Courts can also preserve democratic accountability without deciding climate policy themselves. The Ninth Circuit’s dismissal of *Juliana v. United States* rested largely on the view that the young plaintiffs’ requested remedy would require broad policy choices beyond the court’s role. The judges did not rule that climate harms were unreal or that regulation was generally unlawful.

A narrower form of review can require elected governments to make lawful plans and explain their decisions, while leaving them to choose among complex and politically contested options. Ireland’s Supreme Court, for example, struck down a national climate plan because it lacked enough legal detail, but did not dictate a replacement emissions strategy. 2

Courts may also improve regulation by requiring agencies to explain their scientific, economic and legal reasoning. Research on the “social cost of carbon” shows that estimates can vary because of assumptions about future damage, discount rates, distribution and economic models. That uncertainty supports transparent review rather than treating one estimate as unquestionably correct. 3

The case against

Broad judicial limits could obstruct climate protection that governments are legally required to provide. In *Massachusetts v. EPA*, the Supreme Court held that greenhouse gases qualify as air pollutants under the Clean Air Act and that the EPA could not simply ignore its responsibility. The ruling shows that judicial review can prevent executive officials from evading statutory duties, not just restrain regulation. 4

Rights-based cases point to the danger of courts being too deferential when governments fail to address a documented collective risk. In *Urgenda*, the Netherlands was ordered to cut emissions by at least 25 percent from 1990 levels by the end of 2020. In *KlimaSeniorinnen*, the European human-rights court found that Switzerland had violated an association’s rights by failing to provide adequate climate protection. These cases support courts enforcing minimum duties while allowing governments discretion over the specific measures they use. 5

Weakening emissions standards can also shift major climate and health costs onto the public rather than the companies responsible for pollution. But this economic argument has limits: estimates of those costs depend on disputed assumptions about carbon damage, discount rates and policy baselines. It supports preserving regulatory capacity more clearly than it proves any particular rule is best. 6

Climate lawsuits can influence policy and corporate behavior beyond the judgments themselves. They may clarify government duties, affect public debate, change disclosure practices and alter investment expectations or the value of oil and gas companies. UNEP has documented a large and growing body of climate litigation worldwide, while research reports effects on policy trajectories and markets (see Figure 1). Yet it remains difficult to show that any particular case produces lasting reductions in economy-wide emissions. 7

The bottom line

The evidence favors a bounded form of judicial review, strongly—but not a broad rollback of climate authority. Courts have solid grounds to enforce clear statutory duties, constitutional protections, rights-based minimum safeguards and basic procedural requirements. The strongest examples show that judges can both stop agencies from claiming major powers without clear authorization and require governments to act when the law demands climate protection.

The case for courts choosing detailed energy mixes, setting technical targets without a clear legal mandate or imposing remedies that require broad political and administrative judgments is weaker. Those decisions involve technical capacity, distributional consequences and choices normally made by elected institutions.

The key question, therefore, is not whether courts should favor regulation or deregulation in the abstract. It is whether a particular action falls within delegated authority, respects protected rights and rests on a properly reasoned process. Confidence is high in that limited principle. Confidence is lower about which judicial remedies produce the greatest real-world emissions cuts, because the links between court decisions, government implementation and long-term climate outcomes remain uncertain.