What if Nature is more cooperative, and less competitive, than we think? In the follow-up to her previous book, The Soil Will Save Us, Kristin Ohlson’s Sweet in Tooth and Claw (Patagonia) extends the concept of cooperation in nature to the life-affirming connections among microbes, plants, fungi, insects, birds, and animals — including humans — in ecosystems around the globe. For centuries, people have debated whether nature is mostly competitive — as Darwin theorized and the poet Tennyson described as “red in tooth and claw” — or innately cooperative, as many ancient and indigenous peoples believed. In the last 100 or so years, a growing gang of scientists have studied the mutually beneficial interactions that are believed to benefit every species on earth. Sweet in…