“Over half of Earth’s OXYGEN” is produced by phytoplankton… explains Professor David Thomas, from the school of ocean sciences at the University of Bangor. “If you take that away… you would lose the basis of life on Earth… There simply would NOT be enough OXYGEN to support LIFE.” Professor Thomas said: “If you go back far enough in time… LIFE started in the plankton.

Link: To View Global phytoplankton via NASA’s Aqua satellite:
About phytoplankton: