How chemical pollution is suffocating the sea

Since the 1960s, the extent of open ocean with low oxygen has increased by roughly the area of the European Union. More than 500 low-oxygen sites have been identified in coastal waters. These “dead zones” can cause mass killings of fish and are contributing to climate change. But the problem starts on land, with chemical pollution. This film looks at how this pollution can be tackled, so the ocean can get its breath back.