The Biden administration’s climate rule for power plants dodged a bullet at the Supreme Court this week. But the reprieve is likely temporary as the executive branch confronts the fallout from the court’s recent moves to restrict agencies’ authority. The justices decided to keep the rule in place, for now, as lower courts consider EPA’s authority to limit the power sector’s planet-warming emissions. But the court’s conservative supermajority also signaled a willingness to strike down the rule...