Interesting story on the expenditure of "Labour Energy". They might be on to something here.
http://www.geostudios.ca/geoecoblog/embodied-energy-a-key-measure-of-sustainability -Source
Image Source- http://www.livingbiginatinyhouse.com/next-gen-geodesic-dome-greenhouse-free-open-source-plans/
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From @ramblinmind