I wrote a blog post on applying Effective Altruism to climate change. I used information from Drawdown.org as well as my own analysis. The results show that many solutions that are often promoted like high-speed trains, electric vehicles, green roofs and others are actually very high-cost relative to their CO2 reduction. Less known solutions like silvopasture, restoring tropical forests, and managing food waste are actually much more cost effective per gigaton of CO2 abatement.
You can read the full blog here: https://medium.com/@tsloane/applying-effective-altruism-to-climate-change-e2d703f6414f
I'm curious to get your thoughts on approach and results.