First and foremost, stop reading stuff that tells you that you are doomed and there is no hope. That stuff is not there to give you a realistic understanding of the world. It's there to make you paralyzed and perpetually clicking on things while exerting no actual effort toward any kind of positive change in the real world.

I'm not exaggerating. Doom-bait is engineered by marketing firms and algorithms to give you all the thoughts you just wrote out, and to do nothing about any of it. That's not a metaphor or hyperbole. They literally sit around and figure out how to achieve this effect, because it makes you more profitable to them.

There is even a term for this in the social media biz, although I forget what it's called. Induced amotivation or something?

So first things first, if you're drinking poison, first thing you do is stop drinking the poison. You don't need to answer the question, "well but how is this poison going to get drunk if I don't drink it?" or "how will I find other poison to drink if I stop drinking this poison?"

You are allowed to just stop!

Next, you are already interested in energy and climate change, there is a huge amount of work to do there. And there is a huge amount of work already going on. Who near you is working on renewable energy? Maybe you can volunteer to help them with what they do. Whether it is political organizing or literally setting up solar panels, anything you learn and any experience you gain will be helpful. Maybe there are other defossilization efforts you can be a part of. You do not need to build by yourself a huge space mirror 1000km wide that saves humanity or whatever. You will at least need a university degree first, in order to do that!

For now you can start smaller.

Big changes are possible. They happen. The thing is, they usually involve the work of many thousands and hundreds of thousands of regular people all acting toward a common goal. Eventually you get treaties and people in expensive suits signing things and shaking hands and so on but those moments are built on top of the foundation laid by regular people each doing small work over time.

So you can start by being one of those people, in your own small way. It all counts.

(And don't forget to stop drinking the poison.)