"Ecobuscador is a search engine with Google technology that helps combat climate change.

Ecobuscador saves energy because the colors that are used in full of dark tones. In a monitor, most of the energy is used to display colors more clearly. By using dark tones reduces the use of energy and emits less CO2 into the atmosphere. In January 2007 published a study that showed that only changing the wallpaper google to black would save 750 megawatt-hours per year. "

Well describes the creators of EcoBuscador its search tool. Ecobuscador is a search engine with environmental awareness. It offers a directory of web sites related to the environment. Moreover, can be a search engine in the navigation bar of both Firefox and Internet Explorer 7 (and possibly Opera, but I have not tested)

For further references, please see an article in Wikipedia.