Target your own 40% carbon reduction through social (inter)action with Make Me Sustainable

This site is kind of similar to the Greenopolis concept: (i) join up, (ii) learn about what you can do to reduce your carbon footprint, and (iii) do it thanks to your friends/groups/communities.

Make Me Sustainable does allow you to sign up as an individual or a business or a family – which is a nice take on things – but the main difference for me is that this site has a great carbon footprint manager. There are loads of carbon calculators online, but this one is much more usable and motivational as you can see the effect your changes are having on your footprint.