Also, you claim that it is environmentally friendly to ride a bike. But if I am not mistaken, a cyclists [sic] 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.
-- Washington State Representative Ed Orcutt (R-20), in an email to a constituent defending a proposed tax on bicycles, 25 February 2013