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globalchange

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carbon(109)
population(103)
precipitation(75)
atmosphere(60)
emissions(57)
conservation(56)
density(52)
carbon dioxide(47)
lead(41)
heat(38)
lakes(37)
vegetation(37)
velocity(36)
magnetic field(35)
sediments(35)
surface temperature(34)
forests(33)
earthquakes(32)
oxygen(32)
petroleum(31)
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