Oxygen Levels Throughout Earth's Oceans (IMAGE) University of Toronto Caption These are oxygen concentrations at 1,000 meters water depth in the modern ocean. Reddish to yellow colors show regions with a high oxygen content. Blue tones depict regions with a low oxygen content that are potentially susceptible to hydrogen sulfide poisoning in a warming world. Courtesy of Uli Wortmann/University of Toronto Credit Uli Wortmann/University of Toronto Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.