There are two categories of energy resources: renewable and non-renewable., Non-renewable energy sources are almost impossible to replace once they have been used up., Renewable energy resources, on the other hand, never run out., Non-renewable energy comes from fossil fuels such as coal, oil and natural gas., They were formed over millions of years from the remains of living things, and are found deep underground., Fossil fuels release energy when they are burnt, but they also release large amounts of carbon dioxide, which pollutes the atmosphere and increases global warming., Renewable energy resources include wind, water and solar power., The Earth has an endless supply of these forms of power and using them causes little or no pollution., The power of the wind is converted into electricity using wind turbines., Flowing water, whether from dams or ocean waves, can be very powerful while energy from the sun can provide warmth for our homes., Cutting down on the amount of fossil fuels we use would reduce pollution and conserve the Earth's resources before they disappear completely., We can all help - for example, by walking instead of driving, and turning off the lights when we leave a room..
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