Editor’s Note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has partnered with CNN to drive awareness and education around key sustainability issues and to inspire positive action. CNN  —  Max makes an unlikely conservation worker, and not just because he’s a dog. He’s also bred for hunting. But instead, the English Springer Spaniel is using his supercharged