In 2014, Andrés Cózar and his team presented the first global map of plastic debris. They revealed the existence of 5 great accumulation zones of floating plastic debris, one in the center of each of the ocean basins. The study made a puzzling discovery, the plastic afloat is less than 1% of the total amount entering the ocean. A fragmentation model for plastic debris showed that an important fraction of the missing plastic corresponds to tiny fragments (few millimeters in length or smaller), and a disturbing possibility: these plastic fragments can be mistaken with plankton and be regularly eaten by the organisms in the base of the marine trophic chain.
In 2015, Andrés classified for the first time the Mediterranean as a great plastic accumulation zone of plastic, comparable to those described in the middle of the five ocean basins. Mediterranean Sea was the 6th great accumulation discovered, and opened up the possibility of there being other great accumulations of plastic debris in semienclosed seas.
It was believed that marine litter was primarily a concern in temperate and tropical regions. Not at all. In 2017, an expedition around the North Pole on board TARA vessel revealed the migration of the floating plastic disposed into the oceans towards the pristine waters of the Arctic Ocean. This poleward migration of plastic involves the so-called Thermohaline Circulation, a global conveyor belt currently known for redistributing heat across the global ocean and now connecting the Arctic with sources of marine litter from other parts of the world. More than ever before, preserving the Arctic requires preserving the planet.
More recently, Andrés has coordinated the most comprehensive classification of the objects that make up litter. His research group has also led the most extensive field study to date to identify the sources of marine litter in Europe. His current research extends to remote sensing of marine litter, in collaboration with the European Space Agency.
More recently, Andrés has coordinated the most comprehensive classification to date of objects contributing to global litter. His research group has also led the most extensive field study to date to identify the sources of marine litter across Europe. His current research extends to remote sensing of marine litter, in collaboration with the European Space Agency.