global warming, obesity, oil dependence, air pollution, traffic, depression, terrorism, diabetes, ocean acidification, stress, cardiovascular illness, healthcare costs, wildlife extinction, arthritis, deforestation, water pollution, muscle atrophy, boredom, asthma, and Parkinson's Disease. Apart from that they're practically useless.
I'm thinking of printing this, or something like it up into a poster to send around to bike shops - let me know if you can think of any that I've missed.
Also, these are the last days of my
slogans-to-go-with-earth-posters contest.