A website with detailed steps on eco-terrorism.

If you truly don't need the money, donate it to an org that's doing political advocacy.

10k of solar isn't going to make a difference in the grand scheme of things. Changing laws and regulations will.

Spending and consumning less could help more. Espicially gas and meat.

Invest it into a mutual fund fighting climate change. My bank has one. I guess many banks do. Some relevant terms in their fund names: fossil-free, climate, forest, sustainable agriculture.

Several funds in my bank have ESG in the name.
https://en.wikipedia.org/wiki/Environmental,_social,_and_governance

As a few people have said, buying something like solar panels, or the deposit on an electric car would probably be the best - reducing your impact is probably the most you can do.

The other option could be green investment.... They do exist, ignore 'transitional energy' funds (90% oil majors), look at the individual shares that any fund that looks interesting. I have some money in EdenTree funds. That way your money is hopefully helping do good, while (hopefully) growing so you can do something that will have a bigger personal effect.

Your time and energy is far more valuable than your money.

I would recommend using that money as an emergency fund, and getting involved with an activist organization working to stop climate change. There are a wide range of them, with tactics ranging from legislative pressure to property destruction and civil disobedience. Believe it or not, there are lots of small local problems that a small group can meaningfully impact, and will add up.

While there are systemic problems that cannot be solved by an individual, they can be solved by collective organization. You have to be part of that collective if you want to stop climate change.

Children of Kali

Send it to me, I’ll grow some trees and hemp and shit.

Buy second hand, don't buy new unless you know that the company is trying to solve climate change. Example, at Honolulu there's a company that is setting up water filling stations on some hotels and providing these hotels with aluminum bottles for the folks staying in the hotel so hotels can provide water to their guests and stop plastic pollution.

Well, a certain cadre of income is responsible for the lion's share of western emissions. Maybe you could use that money to "influence" them.