Democrats aren’t really “the left” in the first place, there’s a left wing within the Democratic Party but it also includes a much larger neoliberal wing with the manchins and schumers of the world.

Which of those wings do you think has been bad on the environment?

Personally I’d say it’s the “pro-economy” neoliberal wing more than the left. Say what you want about how effective or practical the left has been, but generally they’re not the ones stripping regulations on hazmat trains or signing off on drilling in nature preserves or building pipelines across crucial aquifers.