It depends where you live. If you live in a area that is going to be devastated by climate change figure out how to be more independent for basic supplies or move. Living in a less devastated area use community networks to help slow it minor and produce capital that will provide for basic needs. A great tactic I have read about is permaculture which is a form of environmentally sustainable food production. Experts in permaculture have been able to increase water retention and grow food in desolate areas. On a individual basis this means you should use those principles to start improving soil and growing food. Which will trap carbon and reduce the reliance on food produced using fossil fuels. Community gardens, suburban backyards, parks, especially rural area, a apartment balcony and guerrilla gardening. Encourage others around you to do the same.

If you live in a area where you think water might become less reliable learn to collect water and make it potable. I know a lot of people here have housing situations which make this idea much less feasible so finding neighbors worried about this kind of thing and doing it on their property is a good idea.

If you live in a area which won't be decimated by climate change expect a influx of migrants into your communities. Be prepared for this by forming groups to help migrants immigrate, achieve basic needs or any other topic you think migrants would struggle with. Even having a group which is openly a safe place for migrants with a rise of xenophobia is a great idea. Many people will loose their homes and be forced to move.