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globalchange

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carbon(12)
organic carbon(7)
population(5)
carbon dioxide(4)
nitrogen(4)
precipitation(4)
surface water(4)
urban areas(4)
vegetation(4)
forests(3)
ph(3)
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altitude(2)
atmosphere(2)
biomass(2)
chlorophyll(2)
conservation(2)
deserts(2)
emissions(2)
grasslands(2)
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