[pepesza]

> And BTW if you do the math a bicyclist (in the US, eating a typical US diet) emits more CO2 per mile than a small car. Assumptions: The bicyclist is riding in addition to any exercise, the riding is not exercise, and the bicyclist eats normal food. A bicyclist who prefers organic, or local, would definitely emit more (both of those emit more CO2 in the growing than regular food).

This result is useless since it makes impression that those miles are interchangeable while they are not. No bicyclist will make same amount of miles per unit of time as car driver. Bicyclist will make other choices: living closer to the job, working remotely, etc.

[crottypeter]

> No bicyclist will make same amount of miles per unit of time as car driver.

Have you never seen urban traffic?