Although I'm sure there aren't many of us who choose to ride instead of drive purely to reduce our environmental impact, there certainly has (at least in the past) been suggestion that we are less environmentally harming than the cages. Mythbusters season premiere is going to investigate this over bikes from the 80's-00's and in real world conditions. I know what I think the result will be, but will be interesting to see and by what sort of margin
http://news.discovery.com/earth/myth...mkcpgn=fbdsc17
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