How Much Energy in a Google Search?

I was just talking with a friend who said he'd heard something about a Google search taking as much energy as boiling a cup of tea.

I found this article which mentions the original reference, but then links Google's repsonse.

Bottom line: Assuming that the original estimate of 15 grams of carbon dioxide generated to boil "a kettle of water" was at all accurate, and using Google's stated 0.2g of CO2 per Google search, the kettle of water takes 75 times as much energy.