“I don’t see what all those environmentalists are worried about,” sneers your great uncle Joe. “Carbon dioxide is harmless, and great for plants!”

OK. Take a deep breath. If you’re not careful, comments like this can result in dinner-table screaming matches. Luckily, we have a secret weapon: A flowchart that will help you calmly slay even the most outlandish and annoying of climate-denying arguments:

Reader support helps sustain our work. Donate today to keep our climate news free. All donations DOUBLED!
Click to embiggen.

Click to embiggen.

This story was produced as part of the Climate Desk collaboration.

Grist thanks its sponsors. Become one.