Environmental Question

How much ozone-damaging, greenhouse-effect-contributing methane is produced by the average granola fart? How many times does the average granola-eating bicycle-riding environazi fart from exertion whilst riding their bike to work?

But really, think cars are bad? How about this little tidbit from the May 1851 Scientific American: 2 to 10 cartloads of manure would be collected on a daily basis from any given mile of London street. We so take our clean, modern cities for granted.