River metals linked to tar sand extraction

Researchers find that pollutants in Canada's Athabasca River are not from natural sources.

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Kelly, E. N. et al. Proc. Natl Acad. Sci. USA doi: 10.1073/pnas.1008754107 (2010).
Kelly, E. N. et al. Proc. Natl Acad. Sci. USA 106, 22346-22351 (2009).
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Hannah Hoag
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Hoag, H. River metals linked to tar sand extraction. Nature (2010). https://doi.org/10.1038/news.2010.439