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  —  A melting glacier draped in the tattered remains of a thermal blanket , a ghostly abandoned mining town in Chile, and an ancient tree marked by floodwaters are among the