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carbon(5)
surface water(4)
conservation(3)
humidity(3)
oxygen(3)
population(3)
precipitation(3)
tree rings(3)
deserts(2)
isotopes(2)
lakes(2)
organic carbon(2)
vegetation(2)
atmosphere(1)
biomass(1)
carbon dioxide(1)
desertification(1)
drought(1)
erosion(1)
estuaries(1)
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