cf. Peter Turchin http://energyskeptic.com/2016/peter-turchin-violence-and-social-unrest-in-the-u-s-and-europe-likely-by-2020/ http://energyskeptic.com/2016/pet

cf. Peter Turchin http://energyskeptic.com/2016/peter-turchin-violence-and-social-unrest-in-the-u-s-and-europe-likely-by-2020/ http://energyskeptic.com/2016/peter-turchin-violence-and-soc...