According to an article in today's Basler Zeitung (unfortunately not available on-line), one Google search uses as much energy as a 10-watt bulb uses in a half an hour. Multiply that by more than one billion searches per day. It's running the server computers that sucks up so much energy.
I was going to do some Google searches to check on that, but I decided not to.
I wonder how much energy each blog post uses.