GEF

3 Contents Introduction 6 UNIT 1 Why Water Matters 1 4 1.1 Our Relationship with Water 16 1.2 History, Civilization, and Water 17 1.3 Water Issues Around the World 20 1.4 The Global Water Crisis 25 1.5 Moving Toward Sustainable Water Systems 30 1.7 Unit Review 34 UNIT 2 Water Science and the Water Cycle 4 0 2.1 Water Physics and Chemistry 42 2.2 Water Resources and the Water Cycle 46 2.3 Aquatic Ecosystems 52 2.4 Water Pollution 55 2.5 The Watershed Framework 59 2.6 Unit Review 61