The International Union for Conservation of Nature report “Ocean Deoxygenation: Everyone’s Problem” which is a collaboration of Dr. Moriaki Yasuhara and other scientists has been published. They found that our global oceanic oxygen reserves have already been reduced by 2% between 1960 and 2010.
The report also attracts media interests and are covered by The New York Times and BBC etc.
Press release:
https://www.iucn.org/news/marine-and-polar/201912/marine-life-fisheries-increasingly-threatened-ocean-loses-oxygen-iucn-report
Full report:
https://portals.iucn.org/library/node/48892