Environmental advocates such as Jacques Cousteau, Dian Fossey and Al Gore are discussed here, along with important environmental movements, including the Animal Rights Movement, the Green Movement and the Antinuclear Movement.

Air pollution's effects are profound and wide-ranging. Acute pollution episodes can cause human fatalities, while ongoing pollution at lower concentrations results in cumulative damage to health. The articles in this title discuss the many different types of air pollution and its various causes.

The concept of preservation of wilderness emerged in the United States as a response to the large-scale disposal of public lands and to such economic activities as mining and logging, which had altered much of the western landscape. The essays here consider the various groups and people who advocate preservation.

The pollution of water supplies, which can be caused by activities such as mining, agriculture, and improper waste disposal, can have negative health impacts on plant and animal life. The types and causes of water pollution, and the policies designed to protect the world's water supplies are all examined in this title.

This title covers a timely topic for the majority of the world: the different types of energy and energy use. Articles cover both fossil and alternative fuels, renewable energy, and energy efficiency and conservation.