Evolving agricultural practices dramatically increased crop production in the twentieth century. Two studies now find that this has altered the seasonal flux of atmospheric carbon dioxide. See Letters p.394 & p.398
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MacBean, N., Peylin, P. Agriculture and the global carbon cycle. Nature 515, 351–352 (2014). https://doi.org/10.1038/515351a
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DOI: https://doi.org/10.1038/515351a
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