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To generate electricity we burn coal. First we dig it out, then we transport it in trains. Coal is the largest source of energy for the generation of electricity world wide, as well as one of the largest world source of carbon dioxide emissions. Coal is composed primarily of carbon along with various quantities of other elements, such as, sulfur, hydrogen, oxygen and nitrogen. Coal is a redily combustible black sedimentary rock. Coal is primarily used as a solid fuel to produce electricity and heat through combustion. The world uses about 6.2 billion tons annually. For more information you can visit:[]