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  the mine, built near Richmond, Virginia, provided valuable war materials during the Revolutionary War.
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  Locomotive engineer George Stephenson successfully tests his "Blutcher" model carrying several wagons full of coal.
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  the drill ushered in an era of global dependance on oil and other products of natural gas
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  the burning of coal produced steam, which turned a turbine that then produced electricity for a growing number of residences and factories.
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  Tesla's electrically powered coil would become the predecessor to Edison's famous light bulb.
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  while nuclear power was initially discovered as a destructive force in world war II, it was later cultivated as a valuable source of energy.
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  solar cells are hailed as a valuable, highly efficient source of energy for homes and businesses
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  natural gas and fossil fuels, all nonrenewable resources, quickly fall into high demand across the world.
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  by 2010, the average american family is saving $100 on their electric bill.
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  Tesla's release spurred many other automobile companies to produce hybrid electric cars.