The author argues that forecasts of quick depletion of resources in the environment as a result of overpopulation and increased usage may not be free from error. Ignorance still exists in understanding the recovery mechanisms of nature. Long-range forecasts are likely to be wrong in such situations. (PS)

This second article of a two-part series examines energy sources other than the principal sources currently in use and discusses the need for early development of sound energy strategies looking beyond the mid-1980's. For the first article, see the May, 1974 issue. (DT)

Comments by two reviewers (Garrett Hardin and Stephen Berry) on the book The Limits to Growth'' by Meadows and others. The nature of the models used, and the reactions of book reviewers are discussed. (AL)

Proposes a method of collecting solar energy by using available plastics for Fresnel lenses to focus heat onto a converter where thermal dissociation of water would produce hydrogen. The hydrogen would be used as an efficient non-polluting fuel. Cost estimates are included. (AL)

Suggests a system for collecting and storing solar energy to be used as the heat source for conventional thermal powerstations. Considers the environmental and demographic impact of such systems in the desert areas of the southwest U. S. (AL)

Discusses three major questions directly concerned with energy policy and the improvement of its rationality: Where are we? How did we get here? What can we do about it? (Author/AL)