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What is Energy?We are constantly using energy. We use it to power machines, cars and other transport. We use it to heat and cool our homes. And we use it to produce electricity for lights and other appliances in our homes, schools and businesses. We use more and more energy in our daily lives. In the last hundred years our energy use has more than doubled. People use more electricity, travel more, and use hundreds of appliances that make our lives easier. But where does all this energy come from? Most energy we use comes from burning fossil fuels, such as coal, oil and gas. The rest of the energy we use around the world comes from nuclear reactors and hydroelectric power, or from other renewable energy sources, like the wind and the sun.
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