Parts per million??

Photo Via: http://westvirginia.sierraclub.org/newsletter/archives/2010/11/a_004.html

When you read about the science behind the climate have you ever been hung up by the units or lost without REALLY knowing the scale of the things you are learning about? NASA's Climate Kids website isn't taking that little problem for granted. Here is a simple and cute explanation of the units involved with talk about carbon dioxide in our planets atmosphere.