Wind and sun are the most familiar forms of renewable energy. While biomass (plant material and animal waste) provides 15 times more energy in United States than wind and solar power combined and still have potential to supply more.
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There is a vast range of biomass energy resources, that includes tree, grass, crops, forestry, agricultural, and urban wastes. Biomass is the oldest source of renewable energy used by humans when they known how to burn fire.
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