Watch Carbon Dioxide move through the atmosphere over the course of years...

http://www.youtube.com/watch?v=j1ehcjjDPy8&feature=player_embedded

The higher CO2 levels occur as plants die off during the summer and winter. Once they regenerate, the plants suck CO2 out of the air, leading to lower concentrations. The swirls are caused by weather patterns blowing the gas around the globe. Cool, huh?

If you want more information about the product, go here...

http://www.esrl.noaa.gov/gmd/ccgg/carbontracker/