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globalchange

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population(137)
carbon(135)
precipitation(87)
density(77)
emissions(71)
conservation(66)
lakes(59)
lead(58)
atmosphere(56)
nitrogen(54)
surface temperature(54)
sediments(52)
forests(51)
carbon dioxide(50)
vegetation(47)
heat(45)
magnetic field(44)
isotopes(42)
atmospheric temperature(40)
sea surface temperature(37)
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