Hi OP, the common question of "what is to be done" has vexed many erstwhile communists.

You're saying something along the lines of, "Okay, I've spent the last year understanding catastrophic climate change on a deep level. So, how do I stop polluting? Do I apply to work at a sanitation company?"

Instead, I would advise you to decide what you'd like to change about your community. Find out if any people or groups are doing that, and if so, join them. If there isn't anyone else doing it already, you'll have to decide on whether to recruit for the task, or do it yourself, or pick another pursuit, or what. While you're doing this, continue to study Marxism, and among people who are inclined to be agreeable with you in your mutual pursuit of your goal, discuss what you study.