About two thirds of Americans overall realize that most scientists think that global warming is occurring and that it is caused by human activities, according to a new poll from Gallup. But the partisan polarization of opinion on climate change continues to be clear. Gallup suggests, "With Trump reversing many of his predecessors' policies aimed at curbing warming, Democrats are feeling a greater sense of urgency about the issue, while Republicans have either remained as skeptical as they had been in the past or have become more so."
Asked "Just your impression, which of the one following statements do you think is most accurate?" 66% of respondents preferred "most scientists believe that global warming is occurring," 6% preferred "most scientists believe that global warming is NOT occurring," and 24% preferred "most scientists are unsure about whether global warming is occurring or not," with 4% expressing no opinion. The "most scientists believe that global warming" statement was preferred by 86% of Democrats, 65% of independents, and 42% of Republicans.
Asked "And from what you have heard or read, do you believe increases in the Earth's temperature over the last century are due more to the effects of pollution from human activities or natural changes in the environment that are not due to human activities?" 64% of respondents chose the human activities response and 33% chose the natural changes response, with 3% expressing no opinion. The human activities response was preferred by 89% of Democrats, 62% of independents, and 35% of Republicans.
According (PDF) to Gallup's report, the poll was conducted by telephone interviews conducted March 1-8, 2018, with a random sample of 1,041 adults, aged 18 and older, living in all 50 U.S. states and the District of Columbia; the sample was weighted to correct for unequal selection probability, nonresponse, and double coverage of landline and cell users in the two sampling frames, and to match national demographics. The maximum margin of sampling error for the total sample was +/4 percent.