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globalchange

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carbon(3177)
population(2374)
emissions(1962)
lead(1422)
precipitation(1409)
conservation(1349)
atmosphere(1206)
density(1183)
heat(1175)
carbon dioxide(1151)
forests(958)
vegetation(782)
lakes(781)
biomass(763)
nitrogen(745)
surface temperature(722)
sustainability(721)
velocity(704)
petroleum(693)
agriculture(687)
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