[counterpig]

Maybe look into investing in triodos bank or something similar.

A lot of the changes that need to happen are quite costly and realistically unless you are a millionaire there isn't a lot you can do to fund a solar or wind farm on your own. But by investing in an ethical bank with a focus on renewable energy you can pool money with other like minded investors to fund these projects.

Another option is a p2p lending platform like abundance https://www.abundanceinvestment.com/investments

But bare in mind these are pretty risky investments.

You could also make steps to reduce your own carbon footprint e.g purchasing solar panels or something similar. Or if you have access to a renewable energy provider or a provider with a green tariff consider switching.

Finally aside from money, investing your time in your local government to make it clear you think they should be doing more is potentially more impactful. Especially if you are based in the US.