New Scientist: Huge areas of ocean could suffocate as a result of global warming. But one of these "dead zones" has been shrinking for a century, we now know. Freak local conditions may be at work, but the discovery offers hope that at least one region of the ocean will still be breathable.
Most tropical coastlines have oxygen minimum zones, which form when plankton die, sink and get eaten by bacteria, a process that consumes oxygen. The majority of marine animals cannot breathe in low-oxygen water, and either...