In their December 2018 report based on key indicators of Americans’ attitudes on climate change, the Yale Program on Climate Change Communication finds concern is growing. Americans increasingly say they have already experienced the effects of global warming, and 65 percent think global warming will harm people in the U.S. According to the report, supported by MacArthur, Americans’ concerns are at an all-time high, and the number of people who are “very worried” about climate change has tripled since its lowest point in 2011.
