Food webs, the greenhouse effect, the nitrogen cycle, renewable energy sources--these are just some essential environmental science concepts. But how do these things actually work? That's what readers discover in this engaging guide to many aspects of the environment. As readers learn about biomes, Earth's cycles, the soil, and more, they are invited to examine detailed diagrams and illustrations that further explain these topics in a creative way. In addition, sidebars highlight important information, and photographs give readers a real-life look at unique environments. This volume also explores dangers to the environment--and what we can do to help.