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population(3)
rural areas(3)
humidity(2)
ph(2)
urban areas(2)
biomass(1)
carbon(1)
conservation(1)
contaminants(1)
deserts(1)
grasslands(1)
heat(1)
irrigation(1)
mortality(1)
organic carbon(1)
particulate matter(1)
phosphorus(1)
precipitation(1)
public health(1)
scattering(1)
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