Someone's designed a fun walking website - put in your route and it will tell you how many kg of Co2 you are saving and how many calories you'll burn!
http://www.walkit.com

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Remember, walking only saves CO2 if the fuel for your legs is CO2 friendly. So walk AND go vegan!

http://www.timesonline.co.uk/tol/news/science/article2195538.ece

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