Leaving PCs on overnight wastes billions in energy costs, study says

The computer you’re reading this on may not seem like a huge energy waster, but the power consumption adds up when joined by the other PCs worldwide (Stamford, Conn., research firm Gartner estimates there are more than 1 billion).

A study released last week puts a finer point on this assertion, reporting that U.S. workers waste $2.8 billion annually in energy costs by failing to shut off their PCs at the end of the work day. What’s more, machines left on during off hours may emit up to 20 million tons of carbon dioxide (C02) this year alone, roughly the equivalent impact of four million cars.

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