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population(9)
carbon(4)
public health(4)
urban areas(4)
rural areas(3)
absorption(2)
density(2)
forests(2)
humidity(2)
oxygen(2)
x-ray(2)
carbon dioxide(1)
carbon monoxide(1)
crown(1)
ecosystem functions(1)
elements(1)
erosion(1)
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evaporation(1)
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