In Colorado, wildfires that have raged for weeks have killed four people, displaced thousands and destroyed hundreds of homes. Because winter snowpack was lighter than usual and melted sooner, fire season started earlier in the U.S. West, with wildfires out of control in Colorado, Montana and Utah.
The high temperatures that are helping drive these fires are consistent with projections by the U.N. Intergovernmental Panel on Climate Change, which said this kind of extreme heat, with little cooling overnight, is one kind of damaging impact of global warming.
Others include more severe storms, floods and droughts, Oppenheimer said.
The stage was set for these fires when winter snowpack was lighter than usual, said Steven Running, a forest ecologist at the University of Montana.
