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For the last 100 years, humans primary energy source has been ________.
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For the last 100 years, humans primary energy source has been ________.
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Mar 20, 2018
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For the last 100 years, humans primary energy source has been ________.
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Mark Davies
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Hey there,
The answer is fossil fuels.
Hope this helps :))
~Top
Mfreiholz
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Mar 24, 2018
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Mfreiholz
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