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Pioneering research in the field of alternative sources of clean energy from renewable sources being carried out around the world has highlighted several possible alternatives to fossil fuels. Bio-fuels made from plants and marine flora have excited the imagination of entrepreneurs and scientists around the world. Bio gas from starch waste and farmyard waste for agricultural and dairy farms and LNG, Bio-diesel and landfill gas for industrial units in urban areas are viable alternative sources of energy. Solar energy plants, wind energy farms, tidal power, wave energy converters and marine current turbines have harnessed the limitless power of nature to provide clean energy.