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population(8)
nitrogen(6)
precipitation(6)
oxygen(5)
sediments(5)
carbon(4)
carbonate(4)
emissions(4)
rural areas(4)
geomagnetism(3)
lakes(3)
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organic carbon(3)
sulfur(3)
surface temperature(3)
urban areas(3)
biomass(2)
density(2)
forests(2)
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