If you’re concerned about climate change specifically, Extinction Rebellion is a protest group agitating to turn the governments of the world against their currently mass-suicidal course of policy. Biden’s been able to do a certain amount about it even in the face of pretty stiff resistance from the entirety of our corrupted governmental system, but the current pace of change isn’t going to be enough to give us a livable planet in the future, so getting involved in the solution seems like a good idea.