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population(1473)
conservation(849)
carbon(635)
forests(601)
density(506)
surface water(503)
lakes(454)
biomass(382)
coral reefs(327)
vegetation(315)
landscape(300)
mortality(288)
urban areas(274)
nitrogen(271)
fisheries(265)
lead(256)
oceans(247)
salinity(244)
humidity(227)
oxygen(224)
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