Source? A quick google search would suggest that around 70% of Americans agree that climate change is real. That's way too low, but still a solid majority.
According to an UN poll, 65% of Americans and 64% of the world think that climate change is a global emergency [1]. In every questioned country, a majority said it's a global emergency.
Did these UN polls consider that people holding these views might not answer to UN polls? I encourage you to try looking for how these questions were answered in polls done by local researchers. At least in Europe, the ratios are the other way around all around the eastern half. In my own country, less than 30% believe climate change is a risk, and even less believe it's caused and/or resolvable by humans - I'm surprised the UN polls say otherwise as not even the EU dares to claim these amounts of approval. Perhaps the UN asked for "any climate change whatsoever" as opposed to "human-driven climate change" - a significant difference...
