Beavers are environmental Swiss Army knives, capable of tackling just about any ecological dilemma. Trying to slow down floods or filter out pollution? There's a beaver for that. Hoping to capture more water for agriculture in the face of climate change? Add a beaver. Concerned about erosion, salmon runs, or wildfire? Take two beaver families, and check back in a year. Ben Goldfarb's captivating book reveals how beavers transformed our landscapes,...