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.