Earth at risk

Examines the phenomenon of global warming, discussing the greenhouse effect in its positive, life-giving configuration, and again as this mechanism is knocked out of balance by increased levels of carbon gases.

Examines the role of economics in preserving or destroying the environment and conflicts between companies and environmentalists.

Examines the results of demographic changes and illustrates the threat of overpopulation to man and his environment.

Examines the problem of land degradation through erosion and deforestation, discussing how these processes occur and what effects they have.

Discusses the problem of acid rain, its causes, how it spreads, and its devastating effects on the environment. Also examines possible solutions to the problem.

Discusses nuclear power and how the positive benefits of nuclear energy are balanced against the problem of disposing of radioactive wastes.

The ozone layer protects life on Earth from harmful ultraviolet radiation but this protective shield is being damaged by chlorofluorocarbons and other pollutants that are now being generated on the Earth.

Discusses the automobile's role in polluting the environment and ways of decreasing the damage.

Describes a variety of energy sources for the future, including solar, water, wind, and thermal power.

Discusses the degradation or destruction of remaining wilderness areas on the Earth and possible ways to save them.