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POPSThis Earth Day in America A Washington Post, ABC News and Stanford University poll reveals: - a third of Americans now say that global warming is the world's single largest environmental problem, double the number of a year ago. - seven in 10 Americans want more federal action on global warming, and half said that believe the government should do much more than it is now. - fifty two percent said the issue is "extremely" or "very" important personally, double the percentage recorded a decade ago. How is this playing out in the lead-up to the presidential elections?