President-elect Trump has said he would withdraw President Obama’s climate rule cutting power-plant carbon emissions…. On energy and environment issues, President-elect Donald Trump appears likely to spend the next four years working to unravel the expansive agenda President Barack Obama has cultivated. Most of the action out of the gate, and potentially for a long time, could involve rolling back regulations . Mr. Trump has said he would withdraw Mr. Obama’s climate rule cutting power-plant carbon emissions, which is already facing a legal challenge that is almost certain to reach the Supreme Court. A federal appeals court decision on that regulation is expected in coming months, and a Trump administration could take the opportunity to opt out of defending the rule. Other regulations Mr. Trump’s administration will likely reconsider include two that have been blocked for now by federal courts: an Interior Department rule setting standards for hydraulic fracturing […]