At stoplights, we look in through the safety glass and feel superior to car drivers, callous polluters closed off from nature in glass and steel boxes.
Bikes use less material and energy in their construction.
Not all riding is green. Seems to me cycling's green only when it keeps us from driving, when it freezes our cars in our garages. Otherwise, we're fooling ourselves calling our bike riding green. I commute five miles each work day on my bicycle. If I weren't a cyclist, I suppose I'd drive a car or ride a motorcycle.