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  —  Ruby Williams’ birthday was not your average 18th. She celebrated it on the Klamath River, with a group of young people making a historic journey paddling from the river’s