Discusses current trends and problems relating to world population, and focuses on action being taken by the United Nations. This year (1974) has been designated World Population Year, and will be highlighted by a conference in Bucharest in which all 130 member governments will meet to confront the issue of population control. (JR)

Described are the proceedings from a symposium on energy and developmentin the Americas. The article suggests that this conference could be a model for the United Nations' conference on science and technology to be held in 1979. (MDR)

Brazil's energy options and current outlook are examined, and a summary of known reserves of fossil and renewable energy resources is given. Suggestions for an energy program designed to preserve Brazilian culture are included. (MDR)

Discusses many of the scientific questions surrounding the greenhouse effect debate and the issue of plausible responses. Discussion includes topics concerning projecting emissions and greenhouse gas concentrations, estimating global climatic response, economic, social, and political impacts, and policy responses. (RT)