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globalchange

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carbon(3130)
population(2320)
emissions(1718)
precipitation(1464)
conservation(1356)
lead(1289)
density(1190)
heat(1140)
atmosphere(1139)
carbon dioxide(1100)
forests(961)
lakes(813)
vegetation(810)
biomass(769)
nitrogen(749)
surface temperature(734)
velocity(716)
surface water(696)
petroleum(665)
sediments(660)
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