Read also this:
http://www.seattlebikeblog.com/2013/03/04/rep-orcutt-says-bicycle-carbon-emissions-not-a-point-worthy-of-even-mentioning/
@Oliver Schick started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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Read also this:
http://www.seattlebikeblog.com/2013/03/04/rep-orcutt-says-bicycle-carbon-emissions-not-a-point-worthy-of-even-mentioning/