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globalchange

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carbon(9)
population(8)
conservation(5)
forests(5)
heat(5)
lead(5)
particulate matter(5)
surface temperature(5)
emissions(4)
isotopes(4)
lakes(4)
nitrogen(4)
oxygen(4)
sediments(4)
surface water(4)
vegetation(4)
agriculture(3)
atmospheric temperature(3)
density(3)
islands(3)
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