Only extraordinary volcanism can explain the presence of parts per billion phosphine on Venus Bains, William ; Shorttle, Oliver ; Ranjan, Sukrit ; Rimmer, Paul B. ; Petkowski, Janusz J. ; Greaves, Jane S. ; Seager, Sara Abstract Publication: Proceedings of the National Academy of Science Pub Date: February 2022 DOI: 10.1073/pnas.2121702119 Bibcode: 2022PNAS..11921702B