Would Earth's early ocean have been a frozen wasteland had levels of atmospheric methane not been sky high? Maybe. Or maybe, according to a new view of an old idea, the main warming agent was carbon dioxide.
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Lyons, T. Warm debate on early climate. Nature 429, 359–360 (2004). https://doi.org/10.1038/429359a
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DOI: https://doi.org/10.1038/429359a