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globalchange

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carbon(261)
population(224)
precipitation(168)
density(159)
conservation(149)
emissions(132)
atmosphere(125)
lead(110)
velocity(95)
sediments(93)
heat(88)
forests(87)
carbon dioxide(85)
lakes(80)
earthquakes(76)
petroleum(75)
landscape(74)
vegetation(73)
isotopes(72)
surface temperature(72)
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