This line graph shows the percentage of Americans over time since 2018 who think global warming is happening or not happening, including those who initially say they don’t know, but then provide their best guess. When Americans who "don't know" if global warming are asked their best guess, more say "yes" than "no". Data: Climate Change in the American Mind, Spring 2023. Refer to the data tables in Appendix 1 of the report for all percentages.