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carbon sequestration(26)
nitrification(26)
phytoplankton(26)
sea water(26)
ammonia(25)
denitrification(24)
biomass (ecology)(23)
grasslands(23)
methane(23)
photosynthesis(23)
air pollution(22)
global change(22)
nitrogen oxides(22)
oxygen(22)
biodiversity(21)
cereal crops(21)
fertilization(20)
nitrogen cycle(20)
carbon cycle(19)
diatoms(19)
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