For 2010 A-1 Limousine through CarbonFund.org mitigated over 2580 metric tonnes of CO2.
This is similar to:
Annual greenhouse gas emissions from 507 passenger vehicles
CO2 emissions from 290.142 gallons of gasoline consumed
CO2 emissions from the electricity use of 314 homes for one year
Carbon sequestered by 66,361 tree seedlings grown for 10 years
Carbon sequestered annually by 552 acres of pine or fir forests
Greenhouse gas emissions avoided by recycling 902 tons of waste instead of sending it to the landfill