The US Supreme Court has limited the Environmental Protection Agency's (EPA) power to reduce greenhouse gas emissions, ruling that the agency does not have the authority to impose sweeping measures without explicit congressional approval. This decision is a major setback to President Joe Biden's climate plans and may hinder the US's ability to achieve its climate targets. The court's ruling gives more power to the courts to target other regulations they don't like, using the 'major questions doctrine'. The decision may have significant implications for the EPA's regulatory responsibilities and the US's efforts to tackle climate change.