It seems that contemporary challenges are far from letting us the possibility to sit idle. To take one of them, the necessity to transform the economy from a carbon emitting economy to a carbon neutral one by 2050 (IPCC 2014 report): it requires to change most of our energy, transports and feeding systems. Concerning the latter, initiatives like permaculture (agriculture based on complementarity between living entities) massively requires human work force: according to S. and Mrs HervĂ©-Gruyer in La permaculture, (2014), based on INRA – Institut national de recherche agronomique – permaculture experiences, 4 million people would be needed to produce fruits and vegetables for France’s consumption following permaculture methods.

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