Specifically, 80–90% of Americans underestimate the prevalence of support for major climate change mitigation policies and climate concern. While 66–80% Americans support these policies, Americans estimate the prevalence to only be between 37–43% on average. Thus, supporters of climate policies outnumber opponents two to one, while Americans falsely perceive nearly the opposite to be true.
This is just how most issues are though. Public support swings wildly depending on how the question is phrased and once you propose a specific solution and enumerate its consequences, almost no one supports it