[layoric]

No sure if you already do this, and know it has been said 1000xs before, but seriously, reducing/cutting meat consumption is probably one of the largest/cheapest impacts you can have for the personal cost.

https://foodtechconnect.com/2014/01/17/infographic-of-the-we...

And if you have the financial means to take the risk to be picky about your job (and are technically inclined), have a read of Bret Victor's "What can a technologist do about climate change?" post, so much to be done assuming it's not all too late already.

http://worrydream.com/ClimateChange/

Most charities are about damage control, not dealing with the problem.

Another option, is invest in a Solar Share program if they are available in your country. Possibility for good returns and helps build more solar energy.