Discover the wonder of trees—one of the most essential life forms on the planet—in this beautifully illustrated, entertaining, and educational guide from the acclaimed author of What We See in the Stars. Trees are fascinating: The oldest living organism on Earth is a tree, and forest biomes cover one-third of the Earth’s surface. Trees provide fruit, spices, nuts, timber, shade, habitats, and oxygen, as well as absorbing carbon dioxide from the atmosphere.