Here is a great example of how not to support a cause. This guy managed to become a physics professor at Princeton but shows an appalling grasp of logic if he thinks trying to reduce CO2 emissions is equivalent to being a Nazi.
Also, it’s not at all clear if he even has any relevant expertise to talk about global warming. His current research doesn’t seem to have anything to do with atmospheric science. Just because he’s a physicist doesn’t mean he’s qualified to weigh in on any science question.