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To make up for this shortfall, the world consumes a lot of fossil energy: about 345 quadrillion British thermal units (3. According to the United States Department of Energy, world energy consumption reached 421 quadrillion British thermal units (Btu) in 2003 and is expected to reach 563 quadrillion Btu in 2015 and 722 quadrillion Btu by 2030. According to the United States Department of Energy, world energy consumption reached 421 quadrillion British thermal units (BTU) in 2003 and is expected to reach 563 quadrillion BTU in 2015 and 722 quadrillion BTU by 2030. |
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