Summarizes what is known about two major variables involved in certain types of chemical pollution that seem to be changing the structure of the Earth's atmosphere. Discusses the greenhouse effect and the ozone layer. (TW)

Contains articles addressing the need to protect endangered species. Includes an introductory article that stresses the relationships between the loss of species diversity and the future of the human society. Seventeen brief articles follow that deal with specific endangered plants and animals. (TW)

Discussed is the continual depletion of the world's natural resources and the plea of conservationists. An examination of the dialectic nature/nurture controversy is used to see whether this may account for the state of disharmony recorded between man and nature. (KR)