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globalchange

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carbon(17)
precipitation(13)
atmosphere(9)
density(9)
lead(8)
oxygen(8)
population(8)
sediments(7)
earthquakes(6)
erosion(6)
surface water(6)
carbon dioxide(5)
emissions(5)
nitrogen(5)
altitude(4)
conservation(4)
glaciers(4)
humidity(4)
isotopes(4)
lakes(4)
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