Cosmic rays produce carbon-14, which enters Earth's carbon cycle after being oxidized. It is of great service to atmospheric chemists in providing a way of tracking the degree to which the atmosphere keeps itself clean.
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Jöckel, P., Brenninkmeijer, C. Natural bleach under scrutiny. Nature 436, 921–922 (2005). https://doi.org/10.1038/436921a
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DOI: https://doi.org/10.1038/436921a