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Months ago, the U.S. Supreme Court agreed to hear an “emergency” request to stay EPA’s new rule regulating interstate air pollution. Like most observers, I was puzzled that the Court was bothering with the case before the D.C. Circuit even had a chance to consider the merits of the challenges. Months later, the Court has finally granted the stay, over a strong dissent from Justice Barrett. EPA may be able to fix the problem with this rule very quickly, and the opinion — at least on first reading — doesn’t seem to carry broad implications for other environmental litigation.

The U.S. Supreme Court agreed June 24 to hear a case about whether environmental impact statements need to address climate change. To read the arguments made about the case, you’d think that this was a common law area where courts establish the rules. But as I discuss in a forthcoming article, recent amendments have put a lot of flesh on the previously barebones law. The bottom line: The Supreme Court shouldn’t give advocates of narrowing the National Environmental Policy Act (NEPA) a victory that they were unable to get through the legislative process.

The U.S. Supreme Court is currently considering whether to overrule the Chevron doctrine. Chevron requires courts to defer to an agency’s reasonable interpretation of an ambiguous statute. We should know by the end of next month whether the current conservative super-majority on the Court will overrule Chevron. In the meantime, it’s illuminating to put the current dispute in the context of the last 80 years of judicial doctrine regarding deference to agencies on issues of law. As this timeline shows, the Supreme Court’s engagement with this issue has been long and complex.

The bad news is that we’re not yet on track to avoid dangerous climate change. But there’s also good news: We’ve taken important steps that will ease further progress. We should resist the allure of easy optimism, given the scale of the challenges. Neither should we wallow in despair. There’s a good basis for hope.

The U.S. Environmental Protection Agency (EPA) has issued a cluster of new rules designed to limit carbon emissions from power generators. Once upon a time, the presumption would have been that the rules would quietly go into effect, until someday a court rules on their validity. These days, we can expect a lot of action to begin almost right away.

In West Virginia v. EPA, the U.S. Supreme Court struck down the Obama-era Clean Power Plan. The heart of the ruling was that the U.S. Environmental Protection Agency (EPA) had engaged in a power grab, basing an unprecedented expansion of its regulatory authority on an obscure provision of the statute. Conservative groups have claimed since then that virtually every government regulation raises a major question. But the doctrine cannot be read that broadly. In particular, the doctrine does not apply to the emission standards for cars that EPA issued last week. As EPA explains in its prologue to the rule, the car standard is very different from the Clean Power Plan.

The Chevron doctrine requires judges to defer to an agency’s interpretation of a statute if that interpretation is reasonable. The State Farm case, which is much less widely known, requires courts to defer to an agency’s expert judgment unless its reasoning has ignored contrary evidence or has a logical hole. As you probably already know, two cases now before the Court will probably result in abandoning or revamping Chevron. But the “abortion pill” case that will be argued today will test the Court’s adherence to State Farm. Will the conservative Justices stand by State Farm even when doing so expands access to abortion?

EPA has just issued a rule tightening the air quality standard for PM2.5 — the tiny particles most dangerous to health — from an annual average of 12 micrograms per cubic meter down to 9 micrograms per cubic meter. EPA estimates that, by the time the rule goes into effect in 2032, it will avoid 4,500 premature deaths, 800,000 asthma attacks, and 290,000 lost workdays. Most likely, by the time this post goes up, someone will have filed a lawsuit to overturn the EPA rule. What legal arguments will challengers raise, and what are their chances of winning? Let’s consider the possible challenges one by one.

In 2023, the Supreme Court ended 50 years of broad federal protection of wetlands in Sackett v. United States. It is only when you look back at the history of federal wetlands regulation that you realize just how radical and destructive this decision was.