If you are a heavy traveler you might not realize it but every time you take an airplane flight you drastically negatively affect your carbon footprint on the environment. In an effort to make travels aware of this very fact, traveling social network Dopplr has teamed with AMEE to calculate your carbon footprint. By investigating past and current trips logged in Dopplr your CO2 emissions are posted on a seperate tab. Users can then contribute their number to the rest of the community or keep it private. I have included an example of the output carbon emissions below.