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population(88)
urban areas(47)
rural areas(43)
carbon(39)
precipitation(36)
forests(28)
conservation(27)
density(26)
humidity(24)
public health(22)
surface water(22)
vegetation(22)
organic carbon(20)
deserts(14)
nitrogen(14)
emissions(13)
fertilizers(12)
drought(11)
grasslands(11)
lakes(11)
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