WILSON, Wyo. — Plant and animal species are estimated to be disappearing at a rate 1,000 times faster than they were before humans arrived on the scene. Climate change is upending natural systems across the planet. Forests, fisheries and drinking water supplies are imperiled as extractive industries chew further into the wild.
But there is another, encouraging side to this depressing story: how a simple idea, born in the United States in the 19th century and now racing around the globe, may yet preserve a substantial portion of our planet in a natural state.