Found this website just random surfing http://www.edenbee.com/

It's a good concept, a social network with an environmental theme. As a profile you are asked to complete a Lifestyle questionnaire which then outputs how 'Environment Friendly' you are :) You can even calculate your Carbon Footprint by taking into account your usage/consumption of various resources and so on.

There are some really active threads on various topics. A stark difference from other social networking sites and this one, IMO, is that though the number of users on edenbee is just a few thousand, it is a big bunch of similar thinking people so there is a lot of synergy.

If you join in, send me a shout out! My profile is http://www.edenbee.com/users/bigfoot