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ARCTIC OCEAN
5
*SEA ICE
4
Ice and Permafrost
4
Snow
4
*ARCTIC REGIONS
3
CLIMATE
3
CONGRESS
3
CONTINENTAL SHELVES
3
NATIONAL SECURITY
3
WATER
3
*CLIMATE
2
ALASKA
2
CANADA
2
DENMARK
2
GASES
2
GLOBAL
2
GREENLAND
2
MERCHANT VESSELS
2
MINERALS
2
NORWAY
2
POLLUTION
2
RISK
2
RUSSIA
2
SHORES
2
TEMPERATURE
2
UNITED STATES
2
*ENVIRONMENTAL PROTECTION
1
*Global climate change
1
*ICE MECHANICS
1
*INDIGENOUS POPULATION
1
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