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globalchange

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carbon(3)
oxygen(3)
tree rings(3)
humidity(2)
isotopes(2)
precipitation(2)
atmosphere(1)
carbon dioxide(1)
conservation(1)
desertification(1)
deserts(1)
drought(1)
earthquakes(1)
iron(1)
oscillations(1)
paleoclimate(1)
soils(1)
stable isotopes(1)
sunshine(1)