I am poor. I would like to fix the environment. How do I affect change? How do I go from helpless to helpful?

I have no money, I have little spare time, limited range of travel.

We see these unfixable problems with climate and no real way of tackling them.

I spent an hour picking up plastic from the beach, could I turn that time and effort into something? Like money or karma or something else.

I can't do it for free as I need money for food. No one wants to pay me to do it. How do we solve this?