Environment
4 total works
Discusses the benefits of water, its pollution, and the harmful effects of and ways of avoiding water pollution.
Discusses the benefits of air, its pollution, and the harmful effects of and ways of avoiding air pollution.
Describes the causes and effects of the greenhouse effect and how it might be stopped.
Studies the important role of atmospheric ozone in protecting the Earth, and tells how man-made chemicals are causing worrisome holes in the polar ozone layers.