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islands(583)
grasslands(372)
carbon(139)
conservation(112)
vegetation(105)
population(100)
soils(82)
nitrogen(71)
precipitation(70)
forests(65)
biomass(64)
lead(49)
density(47)
carbon dioxide(45)
landscape(43)
emissions(38)
drought(32)
earthquakes(31)
coral reefs(30)
organic carbon(30)
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