New York Times: The issue of climate change played almost no role in the 2012 presidential campaign. President Obama barely mentioned the topic, nor did the Republican nominee, Mitt Romney. It was not raised in a single presidential debate. But as Mr. Obama prepares to leave office, his own aggressive actions on climate change have thrust the issue into the 2016 campaign. Strategists now say that this battle for the White House could feature more substantive debate over global warming policy than any previous presidential...