Here's a simple way to reduce your Carbon footprint: use online shopping. Its kind of the same model as using a car pool, only it's individuals' food items not the individuals themselves all being transported in the same vehicles making the process of getting food from your local store to your house much for efficient.

You can see the big mileage difference this creates in the two images here. So basically, if 4 people need to travel 5 miles to the store (there and back remember!) that ads up to 40 miles in total, if the delivery van delivers these 4 peoples' food instead, then the total mileage covered for the same foods to be delivered is only 16 miles.

This would also probably be a good way to drive 5 less miles a week if you are trying to keep up with the Act On CO2 campaign

Woo! Saving the planet made easy!

In this simple model the combined fuel saving is 40%