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population(6)
conservation(3)
loess(3)
public health(3)
surface water(3)
wetlands(3)
carbon(2)
fertilizers(2)
lakes(2)
nitrogen(2)
vegetation(2)
aerosols(1)
air quality(1)
desertification(1)
deserts(1)
drought(1)
dunes(1)
emissions(1)
evaporation(1)
grasslands(1)
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