The problem is that people who do not want to enact federal policy that decimates the US economy (i.e. "Green New Deal"), are deemed "deniers." I'm not into extremism. The US emits 15% of GHG, and until you can get a commitment from countries where they are building new coal plants to this day, it's difficult to take seriously.
"Since 2005 annual U.S. carbon dioxide emissions have declined by 758 million metric tons. That is by far the largest decline of any country in the world over that timespan and is nearly as large as the 770 million metric ton decline for the entire European Union."
https://www.bp.com/en/global/corporate/energy-economics/stat...