Coal: not a sufficient reason for industrial revolution: http://antonhowes.tumblr.com/post/102001277904/national-king-coal … Perhaps not even necessary: http://burycoal.com/blog/2010/02/26/the-history-of-wood-and-coal-in-industrial-transport/ …
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@NickSzabo4 Is there any energy density difference?
@mmeijeri Charcoal is about twice as energy dense as air-dried wood, but wasteful: get only 10-20% of energy of burning the wood directly.
