There are many ways to conserve energy. The most obvious is to not waste it. This can easily be done by shutting off lights when you leave a room, or turning off the computer or TV when it is not being directly used. Some other ways would be to recyle (it takes more energy to produce new cans, for example, than to re-use recycled ones) or re-use bottles or bags so that energy doesn't need to go into making new ones and the others aren't wasted.
Source: www.GetEnergySavingTips.com