Presents a comparison of human population and pathologic models. Builds support for a hypothesis that the human population is a planetary cancer by establishing the following: (1) features of human populations; (2) characteristics of human populations and other biological communities; (3) models of pathologic processes; and (4) malignant…

Describes construction of a model ecosystem using a 10-gallon aquarium with a sand, water and air interface. Pesticides are placed on sorghum plants grown on the terrestrial portion. After 30 days, movement of the pesticide is traced using radioisotope techniques, from terrestrial to aquatic organisms. Details for calculating concentration factors…

Presents a set of simulation models for use in teaching population dynamics. These models are designed specifically for use with a programmable pocket calculator, and can be used to demonstrate growth of populations with discrete or overlapping generations and also to explore effects of density-dependent and -independent mortality. (Author/CS)

Presents a literary review of the positions held concerning a central population issue, development within the ecosphere. Explores concerns posed by contemporary academic economists and ecologists. Suggests that demographers see the issue as an important area of research needing the expertise of several disciplines. (143 references) (MCO)