Irrigation could have locked away more carbon than all the world's plants, and it's somewhere people would never think to look--under the desert. Yan Li of the Chinese Academy of Sciences in Urumqi and his team sampled water from a salty aquifer under the Tarim basin--a desert in north-west China--and from a glacier and river that supply it. Using carbon dating, they were able to produce a timeline showing the rate of carbon's arrival in the groundwater over human history. They found that this rate rose dramatically, by more than a factor of 12 over the past 8000 years.
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