Interesting calculator to see how your car compares to the available hybrid cars. Of course, your bike can't be beat, but this is handy to see how driving a hybrid would change your ecological footprint.
We have an issue with our car (a Subaru). Originally, we were wanting to go completely carless and still strive for this, but now we are looking for a vehicle which is gentler to the environment and can fit three car seats in the back. If anyone has a recommendation, we are open.