So according to the Religion Of Conservatism (or more accurately the Ideology Of Idiots...or the laughable Really Stupid World View That xer0s Shares With Half His Countrymen) apparently the act of riding a bicycle or just engaging in general exercise will pollute the environment.
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.
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