Part of the problem the left currently faces, regardless of revolutionary thought in general, is that environmental concerns are past the election cycle.
It is already too late to stop global warming at the 1.5 C target suggested in 2018.
Gradual reform will be too late. There is no way around it, we are acting too slow, and even if every country in the world flipped Green or whatever in 2028 that might still be too late.
“Too late” is the exact language the fossil fuel execs want you to use. Even if specific targets are passed, every fraction of a degree matters. Stopping warming at 2 is better than 2.1 so if electing Biden puts us on the 2°c track thats better, and maybe the 2028 candidate can put us on the 1.8°C track. Thats a difference worth fighting for