Abstract
Over the last 30 years, the pollution of the environment has increased progressively with the growth of the economy worldwide. Polluting substances such as Co2, So2, Freon, etc., on one hand, and on the other hand, the clearing of forests increased the greenhouse effect and this led to a gradual increase of the temperature in the world. This has led to extreme phenomena around the globe: fires, floods, extremely strong tornadoes, even the displacement of seasons. There are, however, events that cause pollution to decrease. Such a phenomenon is COVID 19.
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