The UN Environment Programme has identified 150 ‘dead zones’ in the world’s oceans, where marine life cannot exist due to lack of oxygen. Some of the dead zones are less than a square km in size, while others are up to 70,000 sq km. Hilltops to Oceans Part 1 looked at how the problems begin on land when agricultural fertilizers and untreated human sewage are washed into rivers and then out to sea. In Part 2, Earth Report travels to Spain, Brazil, Iran and Fiji to find out what is being done about it.
Films in this series