Canada's Trudeau says he talked to Biden over raging wildfires

Canadian Prime Minister Justin Trudeau said that he talked to U.S. President Joe Biden over the wildfires as hundreds of American firefighters have recently arrived in Canada and more are on the way.

Tens of millions of people in North America have been warned of dangerous air quality as intense wildfires rage across Canada, which Trudeau said were caused by climate change. About 3.8 million hectares have already burned.

New York City and Ottawa recorded "hazardous" levels of air quality on Wednesday.  Wildfires are common in Canada's western provinces, but this year flames have mushroomed rapidly in the country's east, making it the worst-ever start to the season.