QUOTE : Half the oxygen we breathe emanates from microscopic phytoplankton sloshing around the surface of the ocean. After literally billions of years of performing that essential, priceless service, those vital organisms now must swim and feed and survive in a sea of plastic soup. Figuring out what’s up with those organisms is, Goldstein suggests, a pretty vital matter. If we are inadvertently killing them off, the result could be far less visible, but even more devastating, than deforestation.