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Today, we burn fossil fuel, such as coal, oil, and natural gas, to make energy. Over millions of years, the decay of plants and animals was formed into fossil fuels. These fuels lie buried between layers of earth and rock. The only way to get them out is to drill or mine for them. While fossil fuels are still being created today by underground heat and pressure, they are being used up more rapidly than they are created. For that reason, fossil fuels are considered non-renewable; that is, they are not replaced as soon as we use them. So, we could run out of them sometime in the future.
Because our world depends so much on energy, we need to find sources of energy that will last a long time. What if there was a type of energy that never ran out? There is. It is called renewable energy.
