evidence: The percentage of Americans who believe humans have caused global warming has not changed notably during the twenty-first century. When asked whether global warming has been caused primarily by human activity, primarily by natural processes, or by both about equally, 82% of respondents pointed to human activity in 2020— nearly the same as the 81% observed in 1997. The percentage of Americans who believe Earth has been warming over the last 100 years, and the proportion of Americans who attribute this warming to human activity, has remained fairly steady over the last 23 years. In one sense, this consistency could be seen as a failure to inform an ever-growing share of the American public that human activities are the leading cause of global warming. [...] When asked what has been causing global warming, 82% of respondents pointed to human activity.