Jeffrey Greenberg/Universal Images Group via Getty Images CNN — The Supreme Court on Friday let stand Biden administration rules that would cut emissions of the planet-warming gas methane as well as mercury in a rare win for an environmental regulation pending before the conservative high court. Related article US Supreme Court to decide whether Mexico may sue gunmakers for border violence The rulings don’t uphold the methane and mercury rules but rather allow the administration to enforce it while underlying legal challenges continue – a process that could take years. Separately, the court is considering another series of emergency appeals requiring coal and new natural gas power plants to dramatically cut emissions. ADVERTISING