Explores the composition of Earth's atmosphere and what we call "air," its importance to life on Earth, the damage that has been done to the air and the ozone layer, and what we can do to clean it before it's too late.
Explores what energy is, sources of energy including fossil fuels as well as alternatives, the environmental impact of using different forms of energy, and how people can conserve energy.
Describes different types of forests and where they grow, explains the role trees play in keeping the air clean, and discusses deforestation, acid rain, and forest conservation.
