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  —  In the year 2000, over 5,000 barrels of crude oil spilled from a barge into the Marañón River, which runs 900 miles (1,450 kilometers) across Peru, from the snow-capped