Phosphate rock demand into the next century. Impact on world food supply. Pimentel, D., Harman, R., Pacenza, M. Pecarsky, J. and Pimentel, M. 1994. Natural resources and an optimum human population. Suzuki, D. 1993.
Overpopulation is bad but overconsumption is worse.
Amy, D.J. 1987. The Politics of Environmental Mediation. Columbia University Press, New York. Burgess, G. and Burgess, H. 1995. Quorum Books, London.