At least 13 die in extreme heat wave in US

At least 13 people have died from the extreme heat wave that has been tormenting the southern United States for two weeks, officials said Friday, with air in other parts of the country polluted by forest fires in Canada.

How Arctic ice melt raises the risk of far-away wildfires

As millions of people in New York and other major North American cities choke on acrid smoke, they could point their accusatory fingers farther North than the wildfires ravaging Quebec—all the way to the global Arctic.

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