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100 dollars a barrel is comparatively cheap, if the energy locked up in oil could be converted into human labour at 5 dollars per hour it would be worth about $45,000.

http://forums.wow-europe.com/thread.html?topicId=268827090&postId=2687330138&sid=1#5

From Joseph A. Tainters "The Collapse of Complex Societies" "The hypothetical society discussed a few paragraphs above responds to stress by increasing complexity. In so doing it increases investment in agricultural and other resource production, in hierarchy, in information processing in...

Humans wondering if fossil fuels will run out is like yeast wondering if the sugar will run out.