The Energy Policy Institute at the University of Chicago surveyed 1,202 American adults in November 2018 about climate change, a carbon tax and fuel efficiency standards.
The survey found that the majority of Americans think climate change is a reality and human activities are the primary cause. Forty-four percent of those who accept that it’s happening, want the government to do something about it and support a carbon tax and many support improved fuel efficiency standards. The results are presented in detail here [pdf].