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Spread across 32 ecoregions ,Alaska's 54 million acres of national parklands are being affected by global warming in many ways , some of them obvious ,others subtle. As wild landscapes change, plant communities, wildlife populations , and humans dependent on park resources must adapt or lose their niche in the ecosystem. Polar bears are a prime example. They're losing critical habitat-near-shore sea ice-at an accelerating rate. Among the 3000 to 5000 polar bears that inhabit Alaska's Arctic lands and waters, a small number follow the ice pack each year into Kotzebue Sound and come aground within two of Alaska's most remote parklands :Bering Land Bridge National Preserve and Cape Krusenstern National Monument. If warming keeps the ice pack from advancing into Kotzebue Sound , polar bears will no longer walk the shores of Alaska's northwest parklands as they have for untold generations.

The disappearance of sea ice is just one example of several climate-related changes that have been documented in and around Alaska's national parklands.

Alaska's glaciers are "thinning" at an accelerating rate. From Kenai Fjords to Wrangell-St. Elias and Glacier Bay, glaciers are contributing enormous amounts of meltwater to the oceans. Of 100 glaciers studied in Alaska and Canada, all but three are losing mass, says University of Alaska, Fairbanks geophysics professor Keith Echelmeyer.