IT research firm Gartner estimates Google's data centres contain nearly a million servers, each drawing about 1 kilowatt of electricity. So every hour Google's engine burns through 1 million kilowatt-hours. Google serves up approximately 10 million search results per hour, so one search has the same energy cost as turning on a 100-watt light bulb for an hour.
This doesn't bode well. Even though the average American performs just 1.5 searches per day, it is hard to imagine that this will not rise dramatically.
The US Environmental Protection Agency estimates that data centres are responsible for 1.5 per cent of US energy use. How much more will that be when we, and our gadgets, are doing hundreds of searches per day? Or when the planet's 6 billion inhabitants all want equal access? We've all heard the future of information architecture is cloud computing. It just might be a cloud of carbon dioxide.
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