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climate change(11)
arctic(9)
methane(6)
permafrost(6)
tundra(5)
carbon cycle(4)
greenland(4)
postsecondary education programs(4)
aerosols(3)
air quality(3)
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alaska(3)
amazon(3)
antarctica(3)
boreal(3)
carbon dioxide(3)
concentration (composition)(3)
global change(3)
greenland ice sheet(3)
mortality(3)
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