Sunday, Dec. 10, 2023 at 8 p.m. on KPBS 2 / Stream now with KPBS Passport + Encore Thursday, Dec. 14 at 7 p.m on KPBS 2. The Arctic National Wildlife Refuge has long protected survivors of the Ice Age, but this once remote and frozen fortress is on the brink of change. Now, for the caribou, musk oxen, polar bears, and Arctic foxes, the ice age is slipping away.