Renewable energy is usable energy derived from sources that are naturally replenished, such as solar energy from the Sun, wind power from wind, hydroelectric power from rivers, geothermal energy from hot springs, tidal power from tides, and biofuels. Often referred to as clean energy, it comes from natural sources or processes that are constantly replenished within human lifetimes. Wind and solar power are virtually nonpolluting, which sharply contrasts with burning fossil fuels.
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