when did fossil fuels become popular
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when did fossil fuels become popular
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history of fossil fuel usage
history of fossil fuel use
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when did fossil fuels become popular, why did fossil fuels become so popular, when did fossil fuels start being used, when did people start using fossil fuels, when did we start using fossil fuels, when was fossil fuels first used, how long have fossil fuels been used, history of fossil fuel usage, history of fossil fuel use, when was fossil fuels invented, when were fossil fuels created, fossil fuels at one time were, how long ago were fossil fuels created, fossil fuel usage by year