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runoff(29)
drought(26)
soil erosion(26)
wetlands(26)
geochemistry(25)
irrigation(25)
land surface(25)
surface water(25)
density(23)
emissions(22)
ph(21)
phosphorus(21)
atmosphere(20)
vegetation cover(20)
landscape(19)
nutrients(19)
degradation(17)
heat(17)
metals(16)
evaporation(15)
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