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Acknowledgements
We thank J. H. Brown, S. K. M. Ernest, L. E. Harding and members of the Smith and Brown lab groups at the University of New Mexico for comments; the National Science Foundation (BIO-0541625) for financial support; F.A.S. thanks NPR Wait Wait Don't Tell Me! and S. Finnegan for providing critical stimulus and motivation to pursue the project.
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Smith, F., Elliott, S. & Lyons, S. Methane emissions from extinct megafauna. Nature Geosci 3, 374–375 (2010). https://doi.org/10.1038/ngeo877
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DOI: https://doi.org/10.1038/ngeo877
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