Prebiotic O2 levels are of interest to origin of life researchers, and perhaps to exoplanet astronomers. But most geobiologists are interested in O2 concentrations after life had originated. More specifically, they seek to understand the co-evolution of atmospheric O2 and life: How were O2 levels affected by life, and how did O2 levels influence life’s development, particularly the origin of eukaryotes and, later, animals? Climate also plays a role in the coevolution question — see, e.g., the book, ‘The Coevolution of Climate and Life’ by Schneider and Londer (1984). However, I...
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