Oil from Algae?
There was recent news about the discovery of 200 marine dead zones all over the world. These dead zones occur when water becomes devoid of oxygen because algae have consumed it. The algae create the oxygen deficit because of their ability to prosper in polluted water that kills off all other marine life but them. With no competitors or predators to curb their numbers, the algae are free to grow uncontrolled and consume oxygen.