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density(6)
atmospheric temperature(5)
altitude(4)
carbon(4)
atmosphere(3)
lakes(3)
organic carbon(3)
population(3)
radiocarbon(3)
conservation(2)
heat(2)
isotopes(2)
leads(2)
magnetic field(2)
marine sediments(2)
precipitation(2)
sediments(2)
stable isotopes(2)
surface temperature(2)
biomass(1)
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