News > Climate Change Made North American Heat Wave 150 Times More Likely

Climate Change Made North American Heat Wave 150 Times More Likely

A record-breaking heat wave that hit the western United States and Canada at the end of June would have been "virtually impossible" without human-caused climate change, according to an analysis by a group of leading climate scientists.

The World Weather Attribution group said that global warming, caused by greenhouse gas emissions, made the heat wave at least 150 times more likely to happen.