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In page Fire:

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Burning fuel converts chemical energy into heat energy; wood has been used as fuel since prehistory.[1] The International Energy Agency states that nearly 80% of the world's power has consistently come from fossil fuels such as petroleum, natural gas, and coal in the past decades.[2] The fire in a power station is used to heat water, creating steam that drives turbines. The turbines then spin an electric generator to produce electricity.[3] Fire is also used to provide mechanical work directly by thermal expansion, in both external and internal combustion engines.[citation needed]