Energy limits and density requirements

causes 98% of earth's land area

to revert to natural environment 

If people lived in three city states shown in yellow. And the all the energy supplied by the hydro electric dams (360 GW) was concentrated in these small areas totalling 2% of the earth land area and no energy was used outside of these areas, because it was need to create the energy density required to support a high standard of living to only 50 million person population. Then 98% of the earth's land area reverts to its natural state. map of civilization locations


sustainable population 

Location of adequate consolidation of hydro electric dams totaling 360 GW



10/13/2014 last rev 7/27/2016

Jack Alpert (Bio)     mail to:     (homepage)      position papers

paypal size  (more details)