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Thick, choking plumes of smoke from Canada's wildfires are pouring into major cities across the Midwest, Northeast and Mid-Atlantic. The polluted air will last through at least Saturday in some areas as new waves of smoke waft south. https://cnn.it/3Tpjm5Y

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Cause and effect. Heat up the planet. Deal with the smoke. Historical Emissions: Since 1751, the United States is responsible for about 25% of all cumulative global emissions—roughly double the historical contribution of China.