Since all electronic devices (often called "vampires") use energy even when they are turned off, you could save $256 and 1,000 lbs. of carbon dioxide per year by unplugging them when not in use.
 
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Unplug Unused Electronics
A standard monitor left on overnight uses enough energy to print 5,300 copies, so at the very least, turn off your monitor and CPU when they are not in use.
Smart power strips that shut down automatically when your electronics are turned off are now available.