How Climate Change Is Upending the Arctic Food Web
A new study shows that melting ice is threatening the survival of polar bears by undercutting the base of their food supply.
Glacial Melting
Glaciers' Unforeseen Foe: Algae
The algae invading glaciers protect themselves from sunlight by turning red, a process that can dramatically increase melting.
Climate Change Could Spell Disaster for National Parks
Hotter temperatures, higher seas viewed as "greatest threat ever" to country's scenic treasures.
A Visit to Dirty Snow Cones National Park
The eponymous highlights of Glacier National Park are fast disappearing.