Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault peak oil Canada Thomas Robert Malthus overshoot dieoff limits to growth economic growth natural limits overpopulation population carrying capacity resource constraints scarcity population crash Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault Canadian population policy population reduction Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault biodiversity ecology food supply agriculture fisheries forestry forests Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault peak oil reproduction war disaster economic collapse coal nuclear Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault natural gas supply soil erosion salination desertification water tables water export Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault EROEI ethanol biodiesel alternative energy wind energy photovoltaic energy Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault fish farm fish farming poverty death disease famine war genocide FEEDBACK AND DIS-EQUILIBRIUM IN HUMAN OVERPOPULATION population stabilization extinction Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault Titanic Easter Island St. Matthew Island reindeer population, environment, sociobiology, human values reproductive behavior positive feedback negative feedback Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault socio-economic values Equilibrium greenhouse gasses greenhouse gas carbon dioxide global warming Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault earth finite absorb wastes destructive effluent destruction environment sexual equality women control reproductive decisions Steve Kurtz Steven B. Kurtz David Delaney Tony Cassils Anthony Cassils Robert Bériault