The report of the International Union for Conservation of Nature (IUCN), which was presented on Saturday during the UN Climate Summit in Madrid COP25, shows that as the climate warms, the process of oxygen reduction in the oceans is progressing.
The report, which was prepared by IUCN experts, is based on data on ocean water quality collected since the late 1950s.
The authors of the report pointed out that in the years 1960-2010 there was a 2% reduction in oxygen content in ocean waters, mainly due to global warming.
"Systematic reduction of oxygen in the oceans is a growing threat to various species and promotes changes in ecosystems. For this reason, among others, they suffer shark, tuna and marlin populations, "noted IUCN experts.
The report showed that global warming leads to warming of the upper oceans and systematic oxygen depletion.
This phenomenon is also intensifying because artificial fertilizers get into the seas and oceans, which contribute to the excessive growth of algae, depriving water of oxygen.
The IUCN report, the world's oldest international nature protection organization, indicates that there are currently 700 areas with oxygen deficiency in ocean waters, and mainly in the Atlantic. In the 1960s there were only 45 such places.
IUCN Director General Grethel Aguilar said during the presentation of the report that urgent steps should be taken to limit these changes, because according to forecasts oxygen in the oceans will continue to decrease. "I am counting on specific provisions on this matter at the Madrid conference," she said.
The International Union for the Conservation of Nature was founded in 1948, has its headquarters in Gland, Switzerland, associates 1.4 thousand. government and non-governmental organizations, and 16 thousand cooperate with it. scientists.