20 km round-trip to a retail park

[Geoff]

4.0 kg CO2e     Distance 20 km at 200 gm CO2 per km     See http://www.greenrationbook.org.uk/smf/index.php?topic=36.0     ("Carbon Footprint of Car Travel" in the "Footprint studies and footprint theory")

[Geoff]

Earth Trends
(http://earthtrends.wri.org/features/view_feature.php?theme=5&fid=53)

"In general, only 75% of the Carbon Dioxide emissions associated with
the entire life cycle of a car is from it's every day use. 19% is the Carbon
Dioxide emitted from the production of fuel, 6% from the extraction of the
raw materials used on the car and the remaining 2% in the cars assembly."

[Geoff]

If 75% of CO2 is in direct emmissions, a car producing 150 gm CO2 per kilometer (the average car?) , should really be 200 gm per kilometer.

This gives 2.00 kg CO2 for a 10 km trip.