Describes the controversy surrounding a report which concluded that, in certain areas and under certain conditions, hydrocarbons released from trees and other vegetation may be more important in the initiation of smog than those released from automobiles. Discusses relevant research which has not been able to support or refute this conclusion.…

Discusses economic factors as the essential causes of world environment deterioration. Presents case for critical and prompt action in prevention of natural resource exhaustion and pollution, particularly by means of replacement level, population control, and consequent economic organization. (JM)

Major consequences of present and additional environmental quantities of DDT pesticide are predictable by mathematical models of transport, accumulation and concentration mechanisms in the Wisconsin regional ecosystem. High solubility and stability produce increased DDT concentrations at high organism trophic levels within world biosphere…