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population(37)
carbon(36)
conservation(23)
emissions(17)
carbon dioxide(14)
density(14)
lakes(13)
nitrogen(13)
fisheries(12)
forests(12)
mortality(12)
surface water(11)
coral reefs(10)
landscape(10)
particulate matter(10)
atmosphere(9)
biomass(9)
lead(9)
sea ice(9)
sediments(9)
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