"The Partisan Divide on Political Values Grows Even Wider," in the words of a headline of a Pew Research Center report dated October 5, 2017 — and public attitudes toward climate change are evidently involved.
Overall, 74% of respondents agreed with "There is solid evidence that the average temperature on Earth has been getting warmer." Among Democrats and Democratic-leaning independents, 92% agreed, but among Republicans and Republican-leaning independents, only 52% agreed.
As for the cause of global warming, 53% of respondents attributed it to human activity, 18% to natural patterns, and 3% indicated that they didn't know; the remaining 23% did not accept that there was solid evidence of global warming.
On the Republican side, 24% of Republican and Republican-leaning independents attributed global warming to human activity, while 25% attributed it to natural patterns and 3% indicated that they didn't know; the remaining 48% did not accept global warming.
On the Democratic side, 78% of Democrats and Democratic-leaning independents attributed global warming to human activity, while 18% attributed it to natural patterns and 2% indicated that they didn't know; the remaining 8% did not accept global warming.
The results are based on a telephone survey conducted June 8 to 18, 2017, among 2504 adults in the United States, and weighted for demographics. The sampling error for the total sample is +/- 2.3%, rising to +/- 3.5% and +/- 3.2% for the Republican and Democratic portions.