Yale University has created a new poll based report, Politics & Global Warming, which describes how Democrats, Republicans, Independents, and members of the Tea Party respond to the issue of global warming. The results come from a nationally representative survey of 1,010 American adults, aged 18 and older, conducted April 23 through May 12, 2011. The samples were weighted to correspond with US Census Bureau parameters for the United States. The study shows majorities of Democrats (78%), Independents (71%) and Republicans (53%) believe that global warming is happening. By contrast, only 34 percent of Tea Party members believe global warming is happening, while 53 percent say it is not happening. While 62 percent of Democrats say that global warming is caused mostly by human activities, most Tea Party members say it is either naturally caused (50%) or isn’t happening at all (21%).