What Biden has not done: stop issuing drilling permits or impose export restrictions on fossil fuels. The former has some serious limits because of how the courts treat the right to drill as a property right once you hold a drilling lease, and the latter is simply untested.
Of course. Climate change is happening, and will keep getting worse until all the biggest countries agree to do and actually go through with doing something substantial about it (or to fully isolate the economies of those that refuse). Nuclear war is just an idea.
It's doubtful curbing CO2 output will put a stop to it now. We're already seeing the beginnings of feedback loops kicking in, and with them runaway climate collapse.