Heat Waves “Almost Certainly” Due to Global Warming

National Geographic: Recent heat waves that have triggered wildfires, droughts, and heat-related deaths in the United States and around the globe "almost certainly would not have occurred" without global warming-and will become more routine in coming years, NASA climate scientist James Hansen says. A new study examining six decades of global temperature data concludes that a sharp increase in the frequency of extremely hot summers can only be the result of human-caused global warming. ee an interactive map of global......

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