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carbon(4015)
population(2424)
emissions(1992)
soils(1831)
precipitation(1673)
conservation(1509)
lead(1452)
nitrogen(1303)
forests(1232)
density(1229)
heat(1224)
atmosphere(1223)
carbon dioxide(1198)
vegetation(1106)
lakes(978)
oxygen(912)
oceans(870)
drought(852)
biomass(838)
landscape(797)
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