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Though it is usually of little consequence in the purchasing decision
of the home user, for giant data centres the advertising claim that the
disk shown consumes 58% less power than its 8GB sibling is a major
consideration.
Large data centres like those run by Google are some of the most energy
consuming facilities in the world.
They tended to be sited near sources of hydroelectric power and next to
rivers, such as the Columbia River, where water from the river is
used to cool the data centre and the waste heat is injected back into
the river.
Every time you do a Google search, you often heat up a river somewhere
by another tiny fraction of a degree.
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