What can I do about climate catastrophe?

First off, quit calling it climate change. That's such an innocuous word, like changing your shirt. What's going on are drastic changes leading to catastrophe. And that is in no way an exaggeration but based on scientific fact. So call it what it is. Next watch this video by Bill McKibben and the Sanders Institute, which calls on us to organize en mass on renewable energy, ending fossil fuel use and divesting our collective money via cities, states, universities etc. from the fossil fuel industry.