If Biden wins, climate activists will still lose. Milquetoast, middle of the road climate "action" from the Democratic party (and similar policies around the world) are why we have broken past every single warning sign that climate scientists have set.
The Kyoto Protocol did nothing, the Paris Agreement did nothing, emissions credits and electric cars (the only policies Biden is pushing) are objectively, scientifically not enough to even do America's part in slowing down climate change. If you think sitting back, doing nothing, and voting for 1 of 2 parties that don't take climate change seriously, once every 4 years, is going to save the world, I'll see you in hell.