"Outside of killing yourself, nothing you do is good for the environment."
"My, what a happy thread...
It's true that bicycling does cause some damage to the environment, especially in the production and distribution phases. It's also true that bicycles couldn't even exist were it not for the vast, mostly petroleum-based industrial culture that we've made for ourselves. Heck, even the roads we ride on are usually made from oil. Qualitatively, there's not much difference between a Hummer and a bicycle. But there is a huge difference in degree. My entire bicycle uses way less than 1/4 the metal and plastic needed for a single car door. The wear and tear on roads produced by bikes is negligible. Once they're sold, new bikes don't produce much of a carbon footprint at all. Except for walking, bicycling is easily the cheapest, most flexible, most environmentally friendly form of transport out there. If I lived on a planet that was overpopulated, running out of fuel and other natural resources, and facing a changing climate due to emissions/deforestation, I would recommend bicycles for the majority of its inhabitants."
All considered cycling seems the less of many evils. Most people driving cars I wouldn't trust to ride my bikes.