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population(24)
carbon(19)
precipitation(16)
density(12)
nitrogen(11)
urban areas(10)
rural areas(9)
conservation(8)
forests(8)
surface water(8)
humidity(7)
organic carbon(7)
carbon dioxide(6)
ph(6)
atmosphere(5)
carbonate(5)
drought(5)
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fluorescence(5)
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