Climate crisis made spate of Canada wildfires twice as likely, scientists find

Burning of fossil fuels made fires at least twice as likely, and the fire-prone weather at least 20% more intense, study shows

The conditions that caused Canada’s extreme spate of wildfires this year, which resulted in parts of the US and Canada to be blanketed in toxic smoke, were made at least twice as likely due to the human-caused climate crisis, scientists have found.

The 2023 Canadian wildfire season has been the largest, and most devastating, on record, with nearly 14m hectares (34m acres) burned, an area larger than Greece. The extent of these fires, more than double the size of the previous record, caused more than a dozen fatalities and thousands of evacuations, and sent a plume of smoke that unfurled as far as Norway and, for a time in June, turned the sky above New York City orange.

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