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eutrophication(13)
nitrogen(4)
air quality(2)
conservation(2)
emissions(2)
heavy metals(2)
metals(2)
nutrients(2)
particulate matter(2)
phosphorus(2)
agriculture(1)
carbon(1)
carbon monoxide(1)
earthquakes(1)
erosion(1)
isotopes(1)
nitrogen dioxide(1)
pesticides(1)
potassium(1)
public health(1)
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