Washington Post: As I said last week, fewer Americans view global warming as a very serious problem today than just six months ago. In October, 39 percent of Americans viewed global warming as a very serious problem, compared with 33 percent who believe that to be true today. Carter is the pollster, but by my back-of-the-envelope math, if you exclude partisan Democrats who will follow President Obama on everything, youre left with about 25 percent of Americans who think that global warming is a very serious problem....