Carbon Offset

CO2 emission equivalency for the average commute trip annually equals approx. 238 gallons of gasoline consumed per year (assumes 20 miles per day @ 21 mpg for 250 workdays per year) or 53.8 tree seedlings grown for 10 years or the carbon sequestered annually equal to 0.48 acre of pine or fir forest.

http://www.epa.gov/cleanenergy/energy-resources/calculator.html

Transportation is the largest and fastest growing end use sector. Contributed 27% of US GHG emissions in 2004. (World Resources Institute)

Here is the calculator for CITYgreen carbon storage

http://www.americanforests.org/productsandpubs/citygreen/

Dr. David Nowak, U.S. Forest Service

http://www.fs.fed.us/ne/syracuse/TREE%20Air%20Qual.pdf

Pounds air pollutants eliminated each year

1 acre Tampa urban trees

• Ozone                           51.4
• Particulate Matter          40.5
• Carbon Monoxide           4.4
• Sulfur Dioxide                21.2
• Nitrogen Dioxide            9.5       
• Carbon Dioxide              16

SOURCE:         Dr. David Nowak, U.S. Forest Service

                        American Forests CITYgreen air quality calculator