Also, you claim that it is environmentally friendly to ride a bike. But if I am not mistaken, a cyclists has an increased heart rate and respiration. That means that the act of riding a bike results in greater emissions of carbon dioxide from the rider. Since CO2 is deemed to be a greenhouse gas and a pollutant, bicyclists are actually polluting when they ride.

Ed Orcutt, WA state representative (via soxiam)

This makes me ashamed of the human race.