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population(11)
conservation(9)
mortality(8)
oceans(4)
contaminants(3)
fisheries(3)
islands(3)
sea ice(3)
ambient noise(2)
carbon(2)
glaciers(2)
lead(2)
nitrogen(2)
population size(2)
agriculture(1)
atmosphere(1)
beaches(1)
biomass(1)
carbon dioxide(1)
clouds(1)
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