The Global Oceanic Environmental Survey, led by Edinburgh University marine biologist Howard Dryden at the university Roslin Innovation Centre had estimated that the plankton in the oceans had been halved in the past 40 years, and that all of it could be gone by 2040. Dryden and GOES were off by twenty years. Plankton is a blanket term for the billions of tiny sea organisms living close to the surface of the oceans, which are eaten by krill,

Source: Climate: Scientists Stunned to Find Atlantic Plankton 90% Gone; Marine Life, our Oxygen Imperiled