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population(6)
forests(4)
conservation(2)
humidity(2)
lakes(2)
nitrogen(2)
particulate matter(2)
pollen(2)
sediments(2)
urban areas(2)
air quality(1)
calcium(1)
deserts(1)
elements(1)
fertilizers(1)
fisheries(1)
fluorescence(1)
grasslands(1)
ice motion(1)
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