Have you read the full Founders Pledge reports on this topic? I'm not sure exactly which post you're referring to, but the full report documents go into a lot more detail.
I'm not sure if either of these were mentioned in Johannes' post, but:
https://drawdown.org/ (explores and compares different solutions for climate change)
https://www.effectiveenvironmentalism.org/careers-advice (EA-informed advice for climate change careers)
"This guide is about what we believe the implications of this changing landscape to be for donors that are motivated by maximizing positive climate impact." Interesting, but ideally it'd be something framed for people looking to work in climate rather than those with money looking to donate.