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carbon(119)
precipitation(92)
population(89)
forests(50)
density(49)
surface water(48)
nitrogen(45)
carbon dioxide(39)
conservation(38)
organic carbon(38)
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lakes(35)
lead(34)
urban areas(34)
humidity(33)
biomass(32)
emissions(32)
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grasslands(29)
atmosphere(28)
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