Human-caused climate change doubled the likelihood of the tinderbox weather conditions that sparked Canada’s massive summer wildfires and in turn angered U.S. President Donald Trump, according to a study released Thursday. And fire and climate scientists said Trump, who has talked about punishing Canada for poor fire management and sending days of choking smoke across the border, should look more in the mirror than up north when it comes to blame. They point to the United States' huge historical emissions of heat-trapping gases from the burning of coal, oil and gas. The fire weather conditions in Northwest Territories and northwestern Ontario, while unusual but not that rare, were still made twice as likely by global warming, said Thursday's study by World Weather Attribution, a group of international scientists who examine extreme weather conditions to see if there are climate change fingerprints. It's about the same as the team found for summer fires in France, but not nearly as clear a climate fingerprint as they calculated in Spanish fires, which the scientists said were 20 times