Part 1 Humans and nature - an overview: an introduction to environmental science; matter, energy and life; biological communities and biomes; human populations. Part 2 Basic concepts: environmental resource economics; environmental health and toxicology. Part 3 Earth and biological resources: food and agriculture; forests, rangelands, parks and wilderness; biological resources; air resources; water resources; energy resources. Part 4 Toward a sustainable future: solid, toxic and hazardous waste; urbanization and sustainable cities; toward a sustainable future. Appendices: world map; units of measurement, metric/English conversion; environmental opportunities for students; environmental organizations.