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nitrogen(6)
population(6)
carbon(4)
lakes(3)
monsoons(3)
organic carbon(3)
deserts(2)
mortality(2)
nitrogen dioxide(2)
particulate matter(2)
surface water(2)
vegetation(2)
agriculture(1)
altitude(1)
biomass(1)
calcium(1)
carbon dioxide(1)
conservation(1)
deforestation(1)
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