Analysis of all U.S. CO2 emissions showing that all driving to and from work represents 5.19% of total U.S. emissions.

1. Emissions from Driving To/From Work Marcus Bowman IAC Transportation June 2008

2. What is the Impact of Driving on U.S. Emissions? 06.04.08 IAC Transportation Marcus Bowman Total U.S. CO2 Emissions Chart shows total U.S. CO2 emissions from all uses (5,983.1 Tg), 2008 EPA Publication 31.2% of U.S. total = Transportation Sector (highlighted in shades of orange) 19.2% = Passenger Cars and Light Trucks (SUV’s, pick-ups, vans)

3. Where Are People Driving To? 06.04.08 IAC Transportation Marcus Bowman Driving Statistics U.S. National Household Travel Survey (2001, most recent available) Going to Work : 27.0% of Vehicle Miles Traveled (VMT) is traveling to/from work . 14.5% Shopping 18.7% Other Family & Personal Business 24.5% Social & Recreational 27.0% To/From Work % of VMT Travel Purpose

4. Amount of U.S. Emissions from Driving To/From Work? 06.04.08 IAC Transportation Marcus Bowman Total U.S. CO2 Emissions Chart shows total U.S. CO2 emissions from all uses (5,983.1 Tg), 2008 EPA Publication 5.19% of Total U.S. Emissions are from driving To/From Work * EPA data shows that CO2 emissions from Passenger Cars and Light-Duty Trucks = 1,149 Tg CO2e, or 19.2% of total U.S. CO2 emissions. * Since work-related driving is about 27% of VMT * We can calculate that work trips account for 310.2 Tg CO2e (27% * 1,149). This equates to 5.2% of U.S. emissions.