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carbon(7)
lakes(7)
biomass(4)
population(4)
surface water(4)
agriculture(3)
forests(3)
isotopes(3)
vegetation(3)
chlorophyll(2)
conservation(2)
earthquakes(2)
eutrophication(2)
infrastructure(2)
lead(2)
nitrate(2)
nitrogen(2)
particulate matter(2)
pesticides(2)
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