Bloomberg: Americans are less concerned about the threat of climate change than they were two years ago and almost half say the seriousness of global warming is overblown, a Gallup Organization Inc. poll shows. Thirty-two percent of people questioned said they believe climate change will affect them or their way of life, down from a high of 40 percent in 2008, according to the survey by Gallup, a Washington-based polling company. Two-thirds say global warming won’t affect them in their …