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population(14)
carbon(8)
lead(8)
mortality(8)
lakes(7)
conservation(6)
emissions(6)
surface water(6)
density(5)
islands(5)
particulate matter(5)
agriculture(4)
grasslands(4)
biomass(3)
calcium(3)
convection(3)
coral reefs(3)
drought(3)
forests(3)
isotopes(3)
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