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density(5)
carbon(4)
population(4)
urban areas(4)
vegetation(4)
atmosphere(3)
forests(3)
mortality(3)
oxygen(3)
sediments(3)
absorption(2)
agriculture(2)
air quality(2)
biomass(2)
boundaries(2)
carbon dioxide(2)
chlorophyll(2)
conservation(2)
electric field(2)
emissions(2)
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