Up until exactly three minutes ago I would allow for some doubt concerning the causes global warming. But now, having seen that the Ask an Ninja ninja is laboring for a more energy efficient planet (by re-using his shurikens), questioning global warming is pretty much inexcusable.
I mean...you just can't argue with the ninja. I mean, you can try, but good luck getting out alive.
Hank Green is the founder and chief geek at EcoGeek.org. Aside from being obsessed with saving the planet with technology, he loves to write and make videos. If you want to find out more about him, visit hankgreen.com