According to the British Sunday Times physicist Alex Wissner-Gross of Harvard University has found that a typical Google search generates about 7g of CO2. In comparison boiling a kettle of water generates about 15g.
This carbon print is mainly caused by the search engine’s data centers, according to this study.
Furthermore, Wissner-Gross’ research indicates that viewing a simple web page generates about 0.02g of CO2 per second. This rises tenfold to about 0.2g of CO2 a second when viewing a website with complex images, animations or videos.