File:Global areas of hypoxia.jpg

Global map of low and declining O2 levels in the open ocean and coastal waters from Breitburg et al. (2018). The global map indicates coastal sites where anthropogenic nutrients have exacerbated or caused O2 declines to <2 mg L–1 (<63 μmol L–1) (red dots), as well as ocean O2 minimum zones at 300 m (blue shaded regions).

• Breitburg, D., Levin, L. A., Oschlies, A., Gregoire, M., Chavez, F. P., and Conley, D. J. (2018) "Declining oxygen in the global ocean and coastal waters". Science, 359: eaam7240. {{doi:10.1126/science.aam7240}}.