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globalchange

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carbon(250)
population(223)
precipitation(165)
density(159)
conservation(142)
emissions(131)
atmosphere(125)
lead(109)
velocity(95)
sediments(90)
forests(87)
heat(87)
carbon dioxide(84)
lakes(78)
earthquakes(76)
petroleum(75)
landscape(74)
isotopes(72)
surface temperature(71)
vegetation(71)
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