Oxygen-starved ocean “dead zones,” where fish and animals cannot survive, have been expanding in the open ocean and coastal waters for several decades as a result of human agricultural and industrial activity. Trying to predict the scale and location of future dead zones, scientists have looked to the past for historical clues.
Click here for original story, Natural nutrient enrichment 8 million years ago caused today’s largest ocean ‘dead zone’
Source: Phys.org