Hikers in New Zealand risk polluting the “clearest lake in the world” with a microscopic alga carried on their boots.

Its name, Rotomairewhenua, was given by the Ngāti Apa, a local Māori tribe. The name’s meaning: the lake of peaceful lands. To New Zealanders, and to the Māori, the small body of water is sacred and ...

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 ...

The lake's impressive depth is not the reason most people make their way to Bear Lake State Park, however -- it's ... Rockies" because it has startlingly blue water reminiscent of the waves ...