Having read this I searched around for other figures on how many searches Google serves each month, and while I didn't find any better sources, I did come acros

Having read this I searched around for other figures on how many searches Google serves each month, and while I didn't find any better sources, I did come across a Google blog entry [1] about the environmental cost of searches. It interested me to know that, based on the average MPG of cars in the US [2] and a rough cost of a gallon of petrol [3], it would cost 1.6% of a GBP penny, or 1/40th of a USD cent, to emit the same amount of CO2 in a car as a single Google search (0.2 grams of CO2 [1]). I'm not sure why I felt the above was interesting enough to write in a comment, but for some reason it does interest me that, if Bill's calculations are correct, it costs Google 27 times as much per gram of CO2 emitted as it does drivers (excluding car costs etc.) Even assuming I'm showing signs of insanity chosing to work that out, the amount of CO2 emitted is good to know. [1] http://googleblog.blogspot.com/2009/01/powering-google-search.html http://googleblog.blogspot.com/2009/01/powering-google-searc... [2] http://en.wikipedia.org/wiki/List_of_2009_United_States_EPA_fuel_economy_ratings http://en.wikipedia.org/wiki/List_of_2009_United_States_EPA_... [3] http://www.speedlimit.org.uk/petrolprices.html http://www.speedlimit.org.uk/petrolprices.html