Introduction Chapter One: Earth Forests and Ecosystems Forest or Farm? Trees Feed the Soil Hang On! Useful Roots Greening Cityscapes From Tiny Acorn to Mighty Oak Corduroy Roads Mycelium Highway Chapter Two: Air Green Lungs What's a Carbon Sink? Look Waaaay Up Koalas Love Their Leaves Epiphytes--Plants in the Air Tree Houses Trees with Roots in the Air Stop that Wind! Fog Drinkers Go Play in the Woods Chapter Three: Water Trees and the Global Water Cycle How Do Trees Drink? Trees Create Rain The Great Green Wall Welcome to the Oasis Ah, Cool! Drink Up! A Feast of Fish Wooden Boats Chapter Four: Fire Wood as Fuel New Life after Fire Ash Enhances Soil Dirty Ash, Clean Soap Let's Dance Warming Up Winter Great Ball of Fire Slash-and-Burn Agriculture Conclusion Acknowledgments Resources Glossary Index.