Agence France-Presse: More Americans than at any time in the past decade believe that the seriousness of global warming is being exaggerated, a Gallup poll showed Thursday. Forty-one percent of Americans told Gallup pollsters that they are doubtful that global warming is as serious as the mainstream media are reporting, putting public skepticism about the hot-button issue at the highest level recorded by Gallup in more than a decade. The previous high came in 2004, when 38 percent of Americans said …