How Global Warming Fueled 5 Extreme Weather Events

FILE -- Drivers of a resupply convoy stand outside their vehicles south of Fort McMurray as a wildfire blocked the only highway to the city in northern Alberta, Canada, May 5, 2016. In a new collection of papers published Dec. 13, 2017, in the Bulletin of the American Meteorological Society, researchers analyzed 27 extreme weather events from 2016 and found that human-caused climate change was a “significant driver” for 21 of them. (Tyler Hicks/The New York Times)