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carbon(4)
urban areas(4)
phosphorus(3)
precipitation(3)
rural areas(3)
forests(2)
nitrogen(2)
organic carbon(2)
population(2)
public health(2)
runoff(2)
storms(2)
agriculture(1)
biomass(1)
conservation(1)
density(1)
deserts(1)
erosion(1)
grasslands(1)
humidity(1)
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