The Far North, a land of extreme weather and intense beauty, is the only region of North America whose ecosystems have remained reasonably intact. Humans are newcomers there and nature predominates. As is widely known, recent changes in the Earth's atmosphere have the potential to create rapid climatic shifts in our life-time and well into the future. These changes, a product of southern industrial society, will have the greatest impact on ecosystems at northern latitudes, which until now have remained largely undisturbed. In this fragile balance, as terrestrial and aquatic habitats change, animal and human populations will be irrevocably altered.