Oceans suffocating as huge dead zones quadruple since 1950, scientists warn

Ocean dead zones with zero oxygen have quadrupled in size since 1950, scientists have warned, while the number of very low oxygen sites near coasts have multiplied tenfold. Most sea creatures cannot survive in these zones and current trends would lead to mass extinction in the long run, risking dire consequences for the hundreds of millions of people who depend on the sea.

https://www.theguardian.com/environment/2018/jan/04/oceans-suffocating-dead-zones-oxygen-starved