THERE IS NO ANSWER
The researchers said that the main reason for the problem is the rising temperatures caused by global warming, and that the hot water cannot hold oxygen. In addition, the experts, who stated that the increasing summer heat causes the upper layer of the lakes to be warmer and less dense than the waters below, explained that the oxygen supply to the depths has therefore decreased.
On the other hand, oxygen levels increased at the surface of the lakes, according to the study. However, this is most likely due to high temperatures that cause algal blooms, which can also produce dangerous toxins. To cope with the climate crisis, reducing emissions is vital, as well as tackling farm manure and urban sewage pollution, which also damages lakes. .