Take a shower
Taking a shower uses about 1/5 of the energy as taking a bath, and as long as you don’t fall asleep it should use less water too. If not, you can always install a “low flow” shower head to limit the amount of water being used.
Unplug your phone charger
When you’re not using it that is. According to the US Department of Energy, appliances consume a significant amount of electricity even when they are switched off. Ever notice how your phone charger can get hot with no phone on it?
Use the top shelf of the oven
Of course, this depends on how technical you want to get with your food but generally speaking hot air rises. The heating mechanism is usually on the bottom of the oven but because it emits bursts of heat the top of the oven tends to be consistently hotter. While this will cook your food faster you may have to sacrifice some crispiness.
Wash with cold water
This is especially true if you are washing or rinsing clothes. About 90% of the energy used in the process goes towards heating the water. So unless you are trying to kill all the germs on your clothes with boiling H2O, this could save you some cash and win you some green points.
Buy a laptop instead of a desktop
Laptops can use up to 80% less energy than a desktop, and unless you are a die hard tech junkie that needs to have the fastest processor on the planet, a modern laptop will suit your needs just fine.