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population(6)
humidity(4)
precipitation(4)
carbon(3)
urban areas(3)
carbon dioxide(2)
evapotranspiration(2)
grasslands(2)
iron(2)
lead(2)
agriculture(1)
air quality(1)
cryosphere(1)
density(1)
emissions(1)
eutrophication(1)
fertilizers(1)
forests(1)
geochemistry(1)
heat(1)
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