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globalchange

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emissions(33)
carbon(24)
carbon dioxide(18)
atmosphere(13)
methane(11)
nitrogen(10)
atmospheric chemistry(7)
nitrous oxide(7)
sulfur(7)
clouds(5)
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heat(4)
nitrate(4)
oxygen(4)
precipitation(4)
radiative forcing(4)
altitude(3)
atmospheric radiation(3)
conservation(3)
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