Standing Room Only: The Challenge of Overpopulation

Africa agriculture and industry algae animals arable land areas Asia average birth control birth rates calories capita Catholic cent annually century chemical Chlorella coal contraceptive cost coun creased crop culture death rates decades Demographic Transition densely populated disease economic efficient emigration energy needs England ergy estimates excessive population pressure factor farm farmers food production food supplies forests Group growing growth rate high birth rates high death rates high living standards human hydroelectric India Japan Kirtley Mather labor Latin America laws of population legumes less low birth rates major Malthus Malthusian means of subsistence million mineral fertilizers nearly North America original calories overpopulated petroleum plants popu population growth positive checks possible potential poverty present population preventive checks primitive protein rapid population growth rapidly recent reduced reserves soil solar energy sources of energy techniques thousand tion ulation underdeveloped utilization Western Europe world population yields per acre