National Public Radio: In Washington, the debate over what to do about climate change is split largely down party lines. But it hasn't always been that way. Republican Sen. John McCain campaigned on the issue in his presidential runs. "Climate change is real," he said in 2007. "The Earth is warming, and it is the result of greenhouse gas emissions." Climate change was on the country's mind that spring in part because deadly storms were ripping through the Midwest. The worst tornado came on the night of May 4, 2007, and...