Answer:
Pollution in the oceans
Step-by-step explanation:
This passage is simply describing the effect that the pollution of the ocean waters had on the composition of the atmosphere. It is a fact that the pollution of the ocean waters i enormous, and unfortunately the oceans became the ''sewage'' of the human kind. Plastic, rubber, oil, are all very dangerous things for the environment, as they harm and often kill off the living organisms, including the producers, which are crucial for the levels of oxygen released into the atmosphere from the oceans.