Overview: Changing weather patterns and animal migrations challenge the survival of those who live off the land. Jody Potts-Joseph turns to the Yukon River to fill her freezer with burbot. Tig Strassburg and his sons set out to provide food for the elders. Daniel and Chase Apassingok scour the Bering Sea for walrus. Joel Jacko searches for moose. And Marvin Agnot builds a community greenhouse.