Energy is one of the most important things in our life. It is used for almost every humans' activities. However, it is limited and we should save it by doing following ways. First, we should use it more efficiently. Turn off the light and electronic devices when we don't use it. Second, use renewable energy sources. Wind, sun, nuclear power is abundant, enough for us to use for billions years. Instead of using coal and other limited resources, we can use clean and renewable sources of energy. Last, not only electricity, other kinds of energy such as water and fuel should be saved. To sum up, energy is not endless and we should reserve it for next generations

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