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Scientists predicted the onset of global cataclysms

Ученые предсказали наступление глобального катаклизмаThis will cause a mass extinction of marine fauna.

Scientists at the University of Otago have found that global warming could lead to catastrophic fall of the level of dissolved oxygen in sea water. This will cause a mass extinction of marine fauna. The study is published in the journal Proceedings of the National Academy of Sciences.

Geologists analyzed the content of uranium isotopes in sediments in England and Italy, whose age is about 100 million years. It is possible to estimate the amount of oxygen in the ancient oceans, as well as the reasons for his exhaustion.

It turned out that during the second oceanic anoxic events 94 million years ago, the oceans were a large number of carbon compounds due to the high content of carbon dioxide in the atmosphere.

According to scientists, now the growth in greenhouse gas concentrations due to human activities is happening much faster and the degree of deoxygenation characteristic of the Cretaceous period, will be reached through the hundreds of thousands, not millions of years. Now in the World ocean occur dead zones — areas where the water contains very little oxygen. According to a study of ecologists from Sweden and USA, the number of dead zones in recent years has exceeded four hundred.

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