Write down the facts that indicate the seriousness of the threat of desertification on Earth.

So, the first fact 1. Ozone holes (The ozone hole is a local drop in the ozone concentration in the ozone layer of the Earth.)
2. Extermination of animals (especially those listed in the Red Book)
3. The melting of glaciers (a flood may occur and the whole Earth will simply flood)
4.Drought (desertification may occur)
5. Deterioration of soil fertility (agricultural work will be suspended and plants will die)