No he not comparing the car exhaust to CO2 from physical exercise.
Orcutt wrote: "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. "
#41 | Posted by paneocon
So if we don't count the tailpipe emissions he is correct. Well we just need to get that magic gasoline that doesn't produce CO2 when burned...