Question

- why is CFC regarded to be the most
dangerous cause of ozone Hole?

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Answer 1

Answer:

Explanation:

The ozone layer is a thin protective layer of gas 10km-50km above the earth, in the upper stratosphere. It acts as a filter for ultraviolet (UV) radiation from the sun. High UV levels can cause skin cancer, cataracts, as well as affecting the growth of plants.

A hole in the ozone layer has developed over Antarctica. Its size changes with the time of year and similar conditions have recently developed over the Arctic, with a small hole in the ozone layer observed there each spring. This is more serious because the northern Polar regions are much more densely populated than their southern equivalent. In 2011, scientists observed a record depletion of stratospheric ozone levels in the Arctic (38%). It is thought that a mix of cold temperatures, chlorine and an unusually strong Arctic vortex caused the unusual thinning. A further large depletion then occurred in 2015- 2016 at 27%. Chemistry climate models predict future cooling of the lower stratosphere if increasing greenhouse gas emission trends persist. Until levels of GHGs return to 1960 levels, similar events of large depletions may occur.

Answer 2

Chlorofluorocarbons (CFCs) destroy the earth's protective ozone layer present on the stratosphere, which shields the earth from harmful ultraviolet (UV) rays generated from the sun.

damage in the ozone can result in potential harm to human health and the environment. Their few causes are :

# increased incidence of skin cancer.

# immunity system damage.

# damage to terrestrial and aquatic life.

# increased formation of ground-level ozone.

thus CFC is regarded to be the most dangerous cause of ozone Hole.

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