Groundwater overuse can push poisonous element deeper — a serious risk for countries in Southern Asia.
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Burgess, W.G. et al. Nature Geosci. 3, 83-87 (2010).
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Vaidyanathan, G. Arsenic sinks to new depths. Nature (2011). https://doi.org/10.1038/news.2011.20
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DOI: https://doi.org/10.1038/news.2011.20