In a far-reaching decision, the US Supreme Court has restricted the jurisdiction of authorities to decide on the interpretation of laws and regulations, including in the climate and environmental sectors. With a conservative majority of six votes to three, the Supreme Court ended the 40-year practice of the so-called „Chevron doctrine“ last Friday. Experts and environmentalists fear that, following the ruling, many other important disputes on US climate policy will be decided in a way that weakens state regulation in this area. The court could thus facilitate attacks on climate policy in a possible second term of Donald Trump as US President.