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The wildfires sweeping Canada have become the largest in its modern history. Across the country, 30 million acres of forest have burned \u2014 three times as much land as in the worst American fire in the past 50 years.\n\nThe scale has forced an international response and a re-evaluation of how the world handles wildfires.\n\nFirefighters on the front lines discuss the challenges they face, and David Wallace-Wells, a climate columnist for The Times, explores how climate change has shifted thinking about wildfires.\n\nGuest: David Wallace-Wells, a climate columnist for The New York Times.