In my opinion, there are greater influences than voter turnout on climate policy. The corporate lobbying, aggressive PR, and disinformation has influenced the state more than any vote. There have historically been no candidates to even vote for that cared about global warming.

And the oil and gas corporations themselves have influenced voters in the same way. Embedding oil into masculinity, lack of global warming discussion in the monopolized media outlets, etc.... Attempts to keep information and awareness from the average voter and make us doubt global warming and even defend oil companies.

IMO, the American state's impulse to protect capital and monopoly is the primary reason the climate response has been so poor.