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The Earth's icy poles, sensitive to changes in climate themselves, also have an enormous impact on the world's environment. Scientists are working to better understand these remote regions in unprecedented ways during the next two years, March 2007-March 2009. Polar Bears Listed as 'Threatened' Due to Loss of Arctic Ice May 14, 2008 UPDATE In a highly anticipated decision, the Interior Department on Wednesday declared the polar bear "threatened" under the Endangered Species Act because of shrinking Arctic ice due to global warming. But Interior Secretary Dirk Kempthorne said the listing should not open the door to use the ESA for regulating greenhouse gas emissions. Analysts examine the impact of the decision. Transcript: Secretary Kempthorne's remarks Law: The Endangered Species Act of 1973 Scientists Plot Pollutants' Path at the Arctic REPORT The Arctic is a receptacle of the planet's air pollutants and a coordinated international effort is geared toward learning more about pollutants' effects at the top of the globe. Slide Show: Learn more about some of the Arctic field studies here. Greenland Residents Detect Sea Changes REPORT Residents of Greenland's west coast say they are feeling the effects of rising sea temperatures in the fishing and tourism industries. NewsHour correspondent Spencer Michels reports on the research into whether the changes are climate change-related.	Main: Polar Discoveries   Researching the Poles   Environmental Impacts   Antarctica: Who's in Charge?   Slide Show: Dry Valley Organisms   Tools of Polar Research   Profiles of Researchers   Archive   Lesson Plan   Exploring Polar Oceanography   Research and Tourism in Antarctica The Global Warming Debate In-depth coverage of global warming, related research and policy decisions International Polar Year More about the IPY, research projects, and educator tools

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