Rainforests have long been recognized as hotspots of biodiversity--but they are crucial for our planet in other surprising ways. Not only do these fascinating ecosystems thrive in rainy regions, they create rain themselves, and this moisture is spread around the globe. Rainforests across the world have a powerful and concrete impact, reaching as far as America's Great Plains and central Europe. In Rainforest: Dispatches from Earth's Most Vital Frontlines,...