An analysis of fossil imprints of ancient raindrops suggests that the density of the atmosphere 2.7 billion years ago was much the same as that today. This result casts fresh light on a long-standing palaeoclimate paradox. See Letter p.359
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*This article and the paper under discussion3 were published online on 28 March 2012.
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Cassata, W., Renne, P. Fossil raindrops and ancient air. Nature 484, 322–324 (2012). https://doi.org/10.1038/nature11036