Global Low Oxygen Map (IMAGE) Smithsonian Caption Low-oxygen zones are spreading around the globe. Red dots mark places on the coast where oxygen has plummeted to 2 milligrams per liter or less, and blue areas mark zones with the same low-oxygen levels in the open ocean. Credit (Credit: GO2NE working group. Data from World Ocean Atlas 2013 and provided by R. J. Diaz) Usage Restrictions This image may be used for non-commercial, educational purposes, provided the credit line above is included. 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.