ARCTIC UPDATE: This is what a ton of Carbon Dioxide looks like

It's pretty much common knowledge that those of us living in industrialized nations are guilty of releasing way too much carbon dioxide into the atmosphere -- a crime of humankind that most agree is speeding up the warming of our planet.

But since carbon dioxide, or CO2, is invisible, it's hard to visualize a ton of the stuff, or roughly the amount of the gas each American is responsible for emitting over the course of 18 days.