Want to fight climate change effectively? Here’s where to donate your money.

If you’re reading this, chances are you care a lot about fighting climate change, and that’s great. The climate emergency threatens all of humanity. Our global response to it has been totally inadequate. Since 2000, carbon dioxide emissions have actually risen 12 percent. We need to reverse that trend — and fast.

The trouble is, it can be genuinely hard to figure out how to direct your money wisely if you want to reduce greenhouse gas emissions. There’s a glut of environmental organizations out there — but how do you know...