Cities at the tipping point - overpopulation destroying major U.S. cities. Ref: https://www.cia.gov/cia/publications/factbook/geos/us.html Ref: http://www.carryingcapacity.org/ A common fallacy is to equate existing and seemingly open or "unused" spaces with the kind of resources and ecologically productive land needed to support human life under modern conditions. In fact, the criterion for determining whether a region is overpopulated is not land area, but carrying capacity. Carrying capacity refers to the number of individuals who can be supported in a given area within natural resource limits, and without degrading the natural social, cultural and economic environment for present and future generations. The carrying...