Google points out that cloud computing is "green"

We could all start using http://Blackle.com instead of directly using Google! in order to save energy.

Blackle is a website powered by Google Custom Search and created by Heap Media, which aims to save energy by displaying a black background and using grayish-white font color for search results.[3] Blackle claims saving almost 2.67 million watt-hours of energy,[4] a claim currently under dispute.[5]

Source: http://en.wikipedia.org/wiki/Blackle.com