Green energy, or renewable / sustainable energy, is derived from a source which meets the needs of the present without getting depleted. Green energy is looked upon as the answer to climate change and as a saviour of the world. Sources of green energy – bio-fuels, solar power, wind power, wave power, geothermal power and tidal power – have begun to be utilized only recently. Green energy includes technologies that improve energy efficiency and are split into first-generation (hydroelectric / geothermal), second-generation (solar/wind energy) and third-generation (biomass gasification, solar thermal) technologies.
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