I just found out today that 1.2% of the electricity consumption in the US was due to data centers and the massive arrays of servers and cooling equipment that they hold (45 billion kilowatt-hours of energy were consumed in 2005).
Worldwide figures say however, that data centers account for about 0.8% of the total global energy consumption. And the other bad news is that between 2000 and 2005, the total number of data centers doubled. These figures were taken from a study commissioned by AMD and was reviewed by major server companies as well as Intel, IBM, Hewlett-Packard, Sun, and Dell.
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