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carbon(12)
lakes(10)
population(10)
surface water(10)
vegetation(9)
deserts(7)
precipitation(7)
conservation(6)
humidity(6)
oxygen(6)
drought(5)
nitrogen(5)
forests(4)
tree rings(4)
water quality(4)
air quality(3)
atmosphere(3)
density(3)
desertification(3)
emissions(3)
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