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agriculture(290)
carbon(103)
conservation(65)
forests(59)
irrigation(57)
soils(55)
population(52)
fertilizers(47)
emissions(45)
erosion(43)
nitrogen(42)
organic carbon(40)
biomass(37)
landscape(37)
vegetation(35)
surface water(34)
sustainability(33)
grasslands(29)
density(28)
fisheries(27)
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