An analysis of geochemical data reveals a substantial change in the composition of Earth's magmas about 2.5 billion years ago, just as Earth's atmosphere and climate were also changing drastically. See Letter p.490
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White, W. Portrait of Earth's coming of age. Nature 485, 452–453 (2012). https://doi.org/10.1038/485452a
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DOI: https://doi.org/10.1038/485452a