clipped from: googleblog.blogspot.com   
The Official Google Blog - Insights from Googlers into our products, technology and the Google culture

a typical search uses "half the energy as boiling a kettle of water" and produces 7 grams of CO2. We thought it would be helpful to explain why this number is *many* times too high. Google is fast — a typical search returns results in less than 0.2 seconds.