Renewable energy source
Renewable energy sources are energy sources that are continually replenished. In contrast, fuels such as coal, oil, and natural gas are non-renewable. Once a deposit of these fuels is depleted it cannot be replenished – a replacement deposit must be found instead. Both renewable and non-renewable energy sources are used to generate electricity, power vehicles, and provide heating, cooling, and light.
Renewable sources of energy vary widely in their cost-effectiveness and in their availability across the United States. Although water, wind, and other renewables may appear free, their cost comes in collecting, harnessing, and transporting the energy so that it can do useful work. For example, to utilize energy from water, a dam must be built along with electric generators and transmission lines.
Renewables themselves are non-polluting, while the structures built to harness them can have positive or negative environmental impacts. For example, dams may affect fish migration but may also create wildlife habitat.
The solar energy was already used in ancient Greece mainly in architecture. The ancient Greeks used solar energy to heat their houses, because they had cut out all the trees in the Greek areas, and the import of the trees was very expensive.
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Water power is a valuable source of energy. When such fuels as coal, oil, and even nuclear fuels are burned up as a source of energy, they cannot be reused.
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Wind energy is the useful energy that we gain when we capture the wind. With its power men could transport bulk goods on the sea, process crops, mill, and later drain extended areas.
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