A renewable resource is a resource that is replaced by the environment over a comparatively short period of time. Renewable resources are desirable over non-renewable resources because they can often be renewed before it is used entirely.
Geothermal energy is a renewable resource that provides heat from the earth. Biofuels are renewable resources that are made from living organisms. They are, in effect, biological fuels. Ethanol is a biofuel that is derived from coal. Biodiesel is a type of vehicle fuel that is made from vegetable oil. Firewood, animal dung and peat are also examples of biofuels.
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