Bad Astronomer Phil Plait continues his rant:
And in this case, saying [carbon dioxide] is plant food is just ignoring the biggest p[roblem here and that you’re heating the world up.
Yeah, plants breathe carbon dioxide and some plants will do better in a more carbon dioxide-rich environment. However, while it is great that you can grow pineapples in Toronto, what’s going to happen to Kansas? These plants down there, when the temperature hits 120 degrees or something like that for months on end because the Earth is warmign up, they’re going to die.