Dr. William E. Rees is an ecological economist and professor at the University of British Columbia’s School of Community and Regional Planning and co- creator of the Ecological Footprint Analysis. The footprint model calculates the area of the Earth’s productive surface necessary to support a particular lifestyle or level of consumption. Dr Rees explains that our present level of resource consumption, coupled with our current population growth, exceeds Earth’s carrying capacity and, therefore, is not sustainable. Unless we change our consumption patterns now, modern civilization as we know it is doomed to collapse.