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emissions(30)
carbon(19)
carbon dioxide(15)
methane(9)
atmosphere(8)
nitrous oxide(6)
atmospheric chemistry(5)
aerosols(4)
clouds(4)
fertilizers(4)
nitrogen(4)
radiative forcing(4)
sulfur(4)
conservation(3)
electricity(3)
nitrate(3)
agriculture(2)
ammonia(2)
environmental impacts(2)
irradiance(2)
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