President-elect Donald Trump on Wednesday chose Oklahoma Attorney General Scott Pruitt to lead the Environmental Protection Agency, according to a transition official, turning to a climate-change skeptic and sharp critic of the agency to take its helm. As the chief legal officer of a major oil and natural-gas producing state, Mr. Pruitt, a Republican, has led legal fights against some of President Barack Obama’s most significant environmental rules, and one of his major roles as EPA administrator would likely be to try to roll back those regulations. That prospect cheered some industry leaders—many of whom have been frustrated as the Obama administration unveiled far-reaching environmental rules as part of the president’s goal of fighting climate change—while drawing objections from environmentalists concerned over Mr. Pruitt’s questioning of climate change. Harold Hamm, a top energy adviser to Mr. […]