United Press International: U.S. President Barack Obama’s green agenda has taken a blow as he now faces a U.S. Congress more skeptical of climate change. An investigation by Think Progress, a Web site run by the Center for American Progress, a self-described progressive Washington think tank, found that 50 percent of the more than 100 Republican newcomers to Congress deny the existence of man-made climate change. A vast majority, 86 percent, opposes climate change legislation that increases government costs. Presumptive…