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emissions(7)
nitrogen(7)
conservation(6)
population(6)
carbon(5)
lakes(5)
agriculture(4)
particulate matter(4)
fisheries(3)
forests(3)
organic carbon(3)
surface water(3)
vegetation(3)
air quality(2)
atmosphere(2)
biomass(2)
boundaries(2)
carbon dioxide(2)
cropping systems(2)
degradation(2)
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