A dangerous trend is noted by scientists in the oceans: new zones appear here, the amount of oxygen in which is catastrophically reduced. According to experts, nitrogen-phosphorus fertilizers that fall into the water with sewage are to blame. And over the years, the number of lifeless sites is becoming more and more. The emergence of such zones contributes to the rapid reproduction of marine unicellular algae, which are food for bacteria \Global warming only accelerates this process, since the temperature is especially comfortable for algae. The ocean is saturated with harmful substances from fertilizers: both from agricultural fields and from city lawns. For the first time, scientists noticed this exactly in the middle of the last century. Since then, they only record the number of dead territories. After all, it is possible to influence the situation only with the support of the entire world community. In 1995, there were already more than three hundred dead sites on Earth, in 2007 – more than four hundred. Over the past decade, their number in the oceans has increased tenfold. Also, signs of life near the coast of the sea, river estuaries, and even areas significantly remote from the coastline, lose their signs. These findings were published in a study undertaken by an international team of scientists. The increase in the number of such zones leads not only to fierce competition in other territories, but also to the destruction of various populations of living organisms. The impact of this trend on the planet as a whole is difficult to overestimate: the oceans are the source of almost half of all oxygen in the atmosphere. The disappearance of oxygen also makes toxic substances such as toxic hydrogen sulfide and nitric oxide more concentrated. To prevent the development of an unpleasant tendency, it is necessary to actively combat global warming. In addition, people are able to reduce the amount of liquid wastes released into coastal waters, both domestic and industrial. A typical example is the American Chesapeake Bay. Here, the water supply system was modernized and the approach to farming was revised. As a result, nitrogen pollution of water decreased by almost a quarter, and the number of dead areas is already approaching zero.