You can't get much greener than this

Bike share programs are popping up all over the world. Paris has one. Montreal has one. Washington DC has one. Barcelona, Helsinki, Stockholm, London, Denver, Melbourne......

Here's a video about the DC version - Capital Bikeshare. Canada's largest bike share system is Bixi Montreal, which started in May 2009. It has over 5000 bicycles at 405 stations. The Paris Vélib system has 20,000 bicycles distributed among 1450 stations. China has impressive stats though. Hangzhou's bike sharing system has over 60,000 bikes found at stations located every 100 meters.