Truevert. Green search engine

Truevert is focused on green, environmental awareness. All searches are done from the point of view of environmental and social concern. The results are obtained from YAHOO BOSS. They are then organized and clustered by Truevert. If you search for the word “carbon” for example, it knows that you want information about carbon’s impact on climate change, not its physical chemistry.

It also arranges the results by related themes in a sidebar, so you can explore tangents. Nice.