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population(5)
altitude(3)
atmosphere(3)
fisheries(3)
nitrogen(3)
rural areas(3)
carbon(2)
conservation(2)
gravity(2)
islands(2)
lakes(2)
methane(2)
surface water(2)
water quality(2)
absorption(1)
aquifers(1)
atmospheric temperature(1)
carbon dioxide(1)
clouds(1)
coral reefs(1)
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