From World Wide Words;
"To exhibit "carborexia" is to have an extreme "dark green" attitude to environmental issues. This can show itself in several ways, such as excessive recycling, but in particular it refers to an obsessive desire to reduce one's personal carbon footprint. The term first appeared in an article in the New York Times on 17 October. The adjective is "carborexic"."
I think we have a new word chaps :-)