Ecosystems—systems, mind you—are as much interconnected and interdependent on us as we are on them. It’s a simple premise, but understanding how to mitigate and undo the harm done to the planet by humans is another matter. Caroline Fraser, author of the recently released Rewilding the World: Dispatches from the Conservation Revolution, says it very simply: "Lose the animals, lose the ecosystem. Lose the ecosystems, game over."