Two unexpected and shocking events have left heads swimming about the fate of President Obama’s signature initiative on climate change, the Clean Power Plan, which aims to replace many coal-fired power plants — the largest source of greenhouse gas emissions in the United States — with cleaner sources of energy.Last Tuesday, the U.S. Supreme Court issued a stay on the Clean Power Plan until the litigation against it is finally resolved, suspending implementation of the plan for the foreseeable future. The vote was 5-4, along the customary ideological lines, and it led to great concern, bordering on quiet despair, among proponents of the plan. who now believed that the Supreme Court would ultimately strike it down. Opponents of the plan, including the coal industry, rejoiced. The court’s order blocking Obama’s Clean Power Plan provides an opportunity for the U.S. to show other nations it has a flexible approach to cutting emissions, David Victor writes.