Biomass - Any fuel taken from a living or recently living material, such as animal waste., Carbon neutral - Takes as much carbon dioxide from the atmosphere as is released., Geothermal - Energy that comes from energy released deep within the Earth., Fossil fuel - Coal, oil and gas are examples, Nuclear fuel - A substance used in nuclear reactors that releases energy as it decays., Renewable energy - Energy from natural sources that is always being replenished and never runs out.,

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