Firstly, you should shut down your computer when you don't need it.Computers are some of the biggest energy users in office buildings. Turn your monitor off at night and ditch the screensaver. Today's computers can be turned on and off over 40,000 times. Opting to shut down over using a screensaver does not affect your computer's lifespan. (EnergyStar). So power down!

Secondly,Choose the right light is a great option.LED bulbs are the most energy efficient lighting option. LED bulbs use 75% less electricity than incandescent bulbs (Energy Star). The also have no mercury, and last about 25 times longer than traditional incandescent bulbs (DoE).

Last but not least, Eliminate vampire power: unplug idle electronics.Devices like televisions, microwaves, scanners, and printers use standby power, even when off. Some chargers continue to pull small amounts of energy, even when plugged in (a good judge of this is if a charger feels warm to the touch). In the US, the total electricity consumed by idle electronics equals the annual output of 12 power plants (EPA).