Explore the world's forests -- find out how they function and evolve over time, discover the plants and animals that live in them, learn about the benefits they bring and the threats they are facing. Shades of Green: Earth's Forests is a comprehensive guide to all types of forests and issues relating to them. Anyone interested in these complex and vital ecosystems will find information on everything from fungi to tourism, from beavers to ecological succession, from climate change and air pollution to prehistoric trees.