 Last year's Canadian wildfires emitted nearly four times more carbon dioxide than airplanes do for a single year. So says research from the World Resources Institute and the University of Maryland. That's about 3.28 billion tons of CO2. According to a study update that has not, we should mention, been peer-reviewed yet, the fires turned skies a bright orange as far south as New York City, and smoke even traveled across the Atlantic Ocean to Europe.