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The diminishment of Arctic sea ice has led to increased human activities in the Arctic, and has heightened interest in, and concerns about, the region's future. The United States, by virtue of Alaska, is an Arctic country and has substantial interests in the region. The seven other Arctic states are Canada, Iceland, Norway, Sweden, Finland, Denmark (by virtue of Greenland), and Russia. The Arctic Research and Policy Act (ARPA) of 1984 (Title I of P.L. 98-373 of July 31, 1984) "provide[s] for a comprehensive national policy dealing with national research needs and objectives in the Arctic." The National Science Foundation (NSF) is the lead federal agency for implementing Arctic research policy. Key U.S. policy documents relating to the Arctic include National Security Presidential Directive 66/Homeland Security Presidential Directive 25 (NSPD 66/HSPD 25) of January 9, 2009; the National Strategy for the Arctic Region of May 10, 2013; the January 30, 2014, implementation plan for the 2013 national strategy; and Executive Order 13689 of January 21, 2015, on enhancing coordination of national efforts in the Arctic. The office of the U.S. Special Representative for the Arctic has been vacant since January 20, 2017. The Arctic Council, created in 1996, is the leading international forum for addressing issues relating to the Arctic. The United Nations Convention on the Law of the Sea (UNCLOS) sets forth a comprehensive regime of law and order in the world's oceans, including the Arctic Ocean. The United States is not a party to UNCLOS. Record low extents of Arctic sea ice over the past decade have focused scientific and policy attention on links to global climate change and projected ice-free seasons in the Arctic within decades. These changes have potential consequences for weather in the United States, access to mineral and biological resources in the Arctic, the economies and cultures of peoples in the region, and national security. The geopolitical environment for the Arctic has been substantially affected by the renewal of great power competition. Although there continues to be significant international cooperation on Arctic issues, the Arctic is increasingly viewed as an arena for geopolitical competition among the United States, Russia, and China. Russia in recent years has enhanced its military presence and operations in the Arctic. China's growing activities in the Arctic have become a matter of increasing curiosity or concern among observers. U.S. military forces have begun to pay more attention to the Arctic in their planning and operations. The Department of Defense (DOD), the Navy, and the Coast Guard have all issued Arctic strategy documents in recent years. Whether DOD and the military services are adequately resourcing these strategies and taking appropriate and adequate actions for defending U.S. interests in the Arctic has emerged as a topic of debate and congressional oversight. The Coast Guard has two operational polar icebreakers and has received funding for the procurement of the first of three planned new polar icebreakers. The diminishment of Arctic ice could lead in coming years to increased commercial shipping on two trans-Arctic sea routes--the Northern Sea Route close to Russia, and the Northwest Passage close to Alaska and through the Canadian archipelago--though the rate of increase in the use of these routes might not be as great as sometimes anticipated in press accounts. International guidelines for ships operating in Arctic waters have been recently updated. Changes to the Arctic brought about by warming temperatures will likely allow more exploration for oil, gas, and minerals. Warming that causes permafrost to melt could pose challenges to onshore exploration activities. Increased oil and gas exploration and tourism (cruise ships) in the Arctic increase the risk of pollution in the region. Cleaning up oil spills in ice-covered waters will be more difficult than in other areas, primarily because effective strategies for cleaning up oil spills in ice-covered waters have yet to be developed. Large commercial fisheries exist in the Arctic. The United States is working with other countries regarding the management of Arctic fish stocks. Changes in the Arctic could affect threatened and endangered species, and could result in migration of fish stocks to new waters. Under the Endangered Species Act, the polar bear was listed as threatened on May 15, 2008. Arctic climate change is also expected to affect the economies, health, and cultures of Arctic indigenous peoples. [ABSTRACT FROM AUTHOR]