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population(10)
carbon(7)
agriculture(5)
precipitation(5)
nitrogen(4)
conservation(3)
contaminants(3)
degradation(3)
drought(3)
emissions(3)
evapotranspiration(3)
heat(3)
irrigation(3)
vegetation(3)
carbon dioxide(2)
density(2)
humidity(2)
infrastructure(2)
lakes(2)
landscape(2)
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