Introduction 1
1 Understanding Our Environment 11
2 Principles of Science and Systems 33
3 Matter,Energy,and Life 48
4 Evolution,Biological Communities,and Species Interactions 71
5 Biomes：Global Patterns of Life 95
6 Population Biology 113
7 Human Populations 127
8 Environmental Health and Toxicology 148
9 Food and Hunger 173
10 Farming：Conventional and Sustainable Practices 191
11 Biodiversity：Preserving Species 218
12 Biodiversity：Preserving Landscapes 242
13 Restoration Ecology 265
14 Geology and Earth Resources 289
15 Climate Change 308
16 Air Pollution 335
17 Water Use and Management 362
18 Water Pollution 385
19 Conventional Energy 410
20 Sustainable Energy 433
21 Solid,Toxic,and Hazardous Waste 459
22 Urbanization and Sustainable Cities 479
23 Ecological Economics 499
24 Environmental Policy,Law,and Planning 523
25 What Then Shall We Do? 543