Last Christmas I was looking for a good climate charity to donate to. I was disappointed to find that GiveWell [2], which does great reviews of charity effectiveness, found a lot effective charities in public health and one in poverty reduction, but nothing in the area of climate. It's very frustrating.
[1] https://www.nytimes.com/2020/02/17/technology/jeff-bezos-cli... [2] https://www.givewell.org/charities/top-charities
(It's also worth noting that addressing global poverty is a pro-climate activity, in addition to be a moral imperative. Its climate-effects may be more long-term than is relevant, though.)
[0] https://www.givingwhatwecan.org/research/other-causes/climat...
There's a similar analysis by Let's Fund: https://lets-fund.org/clean-energy/
From asking a few folks in climate-related academia, they seem to support all of these recommendations
They will not see immediate results, but the change in a few decades with the new mindset etc will be enormous.