The level of oxygen in the ocean is falling, an issue scientists say calls for urgent attention. Decreasing oxygen levels could cause substantial harm to the health of the ocean and the life that depends on it.
Across the planet, oxygen levels have fallen by 2 percent in the last 50 years, according to research from GEOMAR Helmholtz Centre for Ocean Research Kiel in Kiel, Germany. If the problem goes unchecked, global ocean oxygen levels could fall by an average of 7 percent by 2100. Another study found that in some tropical regions, oxygen levels declined by as much as 40 percent. For every degree the ocean warms, oxygen concentration decreases by 2 percent.