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agriculture(7)
population(5)
conservation(4)
fertilizers(3)
pesticides(3)
aquaculture(2)
rural areas(2)
altitude(1)
boundaries(1)
coastal areas(1)
contaminants(1)
diffusion(1)
emissions(1)
erosion(1)
famine(1)
forests(1)
infrastructure(1)
invasive species(1)
irrigation(1)
lead(1)
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