Уже сегодня в мировом океане имеются так называемые мертвые зоны, где кислорода нет, и их количество неуклонно расет.
Oxygen is necessary to support life on Earth. Oxygen makes up about 21% of the air we breathe and half of this oxygen is produced by phytoplankton in the ocean. All aerobic life requires oxygen to produce energy. In water, oxygen is found in a dissolved form and is much more limiting. For this reason, we measure dissolved oxygen in water not in % but in units of umol/kg. The highest concentrations of dissolved oxygen in the ocean are found within the surface mixed layer at concentrations of > 200 umol/kg. Below the surface mixed layer, oxygen concentrations are lower due to respiration by all of the trillions of organisms and bacteria that live in the water column.