“I don’t see what all those environmentalists are worried about,” sneers your Great Uncle Joe. “Carbon dioxide is harmless, and great for plants!”
Okay. 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:
![](http://images.newrepublic.com/2726d550e29b6705845c6c4114ed32e635b8ab38.jpeg?w=800)
This story was originally published by Mother Jones and is reproduced here as part of our Climate Desk collaboration.