Online 4 earth
They're a web hosting provider but it's really hard to figure that out. Their front page has a discussion of making the world a better place and the search for ideal solutions etc, but it's hard to get at what they're talking about.
They have a page listing types of green web hosting. They say "100% carbon neutral". But I'm not sure it's a good idea to work with them unless they make it clear what they're doing.