A high-stakes environmental dispute over a proposed transmission line across the Andes has drawn in Leonardo DiCaprio, with the actor urging Chilean officials to change the route rather than move a tiny frog closer to extinction. What happened? In an Instagram appeal to nearly 60 million followers, DiCaprio said fewer than 1,000 Pehuenche spiny-chest frogs remain in the wild, according to Bloomberg. He warned that the planned transmission link b…