Wall Street Journal: Climate change is back on the agenda in Washington after President Barack Obama's call to action in his second inaugural address. And while polls suggest that public belief that manmade causes are behind warmer temperatures isn't yet back to the levels seen in the middle of the last decade, concern about climate change is recovering from the economic collapse of 2008-09, which buried the issue under economic worries. Among the significant divides in public attitudes is age. In an October poll by...