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population(87)
urban areas(46)
rural areas(43)
carbon(36)
precipitation(32)
forests(28)
conservation(27)
density(24)
humidity(23)
public health(22)
surface water(20)
vegetation(19)
organic carbon(18)
deserts(14)
emissions(13)
nitrogen(13)
fertilizers(12)
drought(11)
grasslands(11)
biomass(10)
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