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conservation(25)
population(23)
forests(15)
density(8)
vegetation(8)
urban areas(7)
carbon(6)
coral reefs(6)
fisheries(6)
surface water(6)
landscape(5)
oceans(5)
rural areas(5)
islands(4)
lead(4)
atmosphere(3)
biomass(3)
carbon dioxide(3)
grasslands(3)
oscillations(3)
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