After a description of the current constraints on energy growth, the author concludes that solar energy is by far the most attractive energy source. The constraints described fall into the following categories: heat limits, pollution, material constraints, financial constraints, and political limits. (BM)

A discussion of a global timetable for conversion to solar energy uses which includes examinations of intermediate energy sources like ethanol, wind, and methane is given. (MDR)

A review of the environmental problems identified on Earth Day 1970 is presented. Problems on conspicuous consumption, combustion of fossil fuels, and toxic substances are discussed. (SMB)

Focusing on the need for energy to sustain economic development on a long-term basis, the document examines energy options of the post-petroleum era in developing nations. Nuclear power and solar power are the most important among proposed alternative energy sources. Limited applicability of nuclear technology to the Third World is discussed.…