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Earliest land plants created modern levels of atmospheric oxygen.
Lenton TM, Dahl TW, Daines SJ, Mills BJ, Ozaki K, Saltzman MR, Porada P. Lenton TM, et al. Among authors: porada p. Proc Natl Acad Sci U S A. 2016 Aug 30;113(35):9704-9. doi: 10.1073/pnas.1604787113. Epub 2016 Aug 15. Proc Natl Acad Sci U S A. 2016. PMID: 27528678 Free PMC article.