The Supreme Court curbed the Environmental Protection Agency’s ability to broadly regulate carbon emissions from existing power plants, a major defeat for the Biden administration's attempts to slash emissions at a moment when scientists are sounding alarms about the accelerating pace of global warming.
In addition, the court cut back the agency's authority in general invoking the so-called "major questions" doctrine — a ruling that will impact the federal government's authority to regulate in other areas of climate policy, as well as regulation of the internet and worker safety.
The ruling was 6-3. Chief Justice John Roberts wrote the opinion for the conservative majority, with the three liberal justices dissenting.
The decision is one of the most consequential cases for climate change and clean air in decades.