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population(10)
carbon(9)
conservation(9)
lakes(5)
agriculture(4)
coral reefs(4)
islands(4)
lead(4)
mortality(4)
nitrogen(4)
vegetation(4)
carbon dioxide(3)
density(3)
forests(3)
hydrocarbons(3)
oxygen(3)
particulate matter(3)
ph(3)
precipitation(3)
degradation(2)
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