The reintroduction of gray wolves to Yellowstone National Park in 1995 triggered a cascade of knock-on effects. The wolves kept herbivores like elk in check and on the move, reducing their browsing pressure on young trees. As a result, groves of willow and aspen sprouted along watercourses, creating ideal conditions for a thriving beaver population. The busy beavers in turn engineered wetlands where a diversity of fish, songbirds and invertebrates flourished. In short, the return of the top predators transformed the U.S. national park into a biodiverse, fully functioning, carbon-sequestering e…

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