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agriculture(2)
carbon(2)
conservation(2)
biomass(1)
density(1)
erosion(1)
grasslands(1)
gravity(1)
herbivory(1)
lakes(1)
landscape(1)
pesticides(1)
petroleum(1)
population(1)
soil erosion(1)
surface water(1)
terrestrial ecosystems(1)
wetlands(1)