Energy of Slaves
Energy of Slaves Oil and the New Servitude By Nikiforuk, Andrew Book - 2012

The comparison with ancient Rome and its habit of using Slaves is compared to our use of petroleum in (so far as I have gotton), creating food,
Food demands on energy amounts to 16% is the US, and 20% in France. Interestingly, Jancovic uses the slave model to determine that it would take 100 slaves toiling for each and every citizen of France to make enough food. Or, in order to make 3,300 kilocalories of food, it takes about 25,745 calories of energy. Many exampels in this book about these descrepancies as compared to ancient times. Above web site refers to fracking promoters too rosey picture of such production.

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