<P> Prior to the latter half of the 18th century, windmills and watermills provided the energy needed for industry such as milling flour, sawing wood or pumping water, and burning wood or peat provided domestic heat . The widescale use of fossil fuels, coal at first and petroleum later, to fire steam engines enabled the Industrial Revolution . At the same time, gas lights using natural gas or coal gas were coming into wide use . The invention of the internal combustion engine and its use in automobiles and trucks greatly increased the demand for gasoline and diesel oil, both made from fossil fuels . Other forms of transportation, railways and aircraft, also required fossil fuels . The other major use for fossil fuels is in generating electricity and as feedstock for the petrochemical industry . Tar, a leftover of petroleum extraction, is used in construction of roads . </P> <P> Levels of primary energy sources are the reserves in the ground . Flows are production of fossil fuels from these reserves . The most important part of primary energy sources are the carbon based fossil energy sources . Coal, oil, and natural gas provided 79.6% of primary energy production during 2002 (in million tonnes of oil equivalent (mtoe)) (34.9 + 23.5 + 21.2). </P> <P> Levels (proved reserves) during 2005--2006 </P> <Ul> <Li> Coal: 997,748 million short tonnes (905 billion metric tonnes), 4,416 billion barrels (702.1 km) of oil equivalent </Li> <Li> Oil: 1,119 billion barrels (177.9 km) to 1,317 billion barrels (209.4 km) </Li> <Li> Natural gas: 6,183--6,381 trillion cubic feet (175--181 trillion cubic metres), 1,161 billion barrels (184.6 × 10 ^ m) of oil equivalent </Li> </Ul>

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