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A comment on The real roots of early city states may rip up the textbooks. Parent comment

Re:The real roots of early city states may rip up the textbooks by nyolfen on Sunday October 15, 2017 @12:37AM (#15475908)
ammonium nitrate for instance is frequently (typically?) manufactured as a petrochemical
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Re:The real roots of early city states may rip up the textbooks by gmueckl on Sunday October 15, 2017 @08:05AM (#15476804)
Hydrogen is for the most part produced from natural gas through steam reforming (only a small fraction is produced through electrolysis). And the Haber-Bosch method requires substantial heating which is also usually supplied by burning oil or gas based fuels.
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