What is Ozone layer...? And why it is important?

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What is the ozone layer, and why is it important?

Human activity has depleted this protective layer of the stratosphere, but scientists believe it is on the mend.

The ozone layer is critical to making the world habitable for humans and other creatures. The ozone layer absorbs the majority of the sun's UV energy high in the atmosphere, between 10 and 50 kilometres above the earth's surface.


However, people were generating enormous amounts of compounds that destroyed the ozone layer during the 1970s, 1980s, and 1990s. As a result, ozone holes formed near the Earth's poles, exposing life to higher levels of UV light and increasing the risk of skin cancer in humans.

The world joined together in the 1980s to forge an international accord to cut – and eventually eradicate – emissions of these depleting pollutants. Political agreements were extremely effective. Since then, global emissions have decreased by more than half.

Emissions of ozone-depleting chemicals have decreased by more than 99%.

The Montreal Protocol was signed in 1987, and it was the first global agreement to reduce the use of compounds that deplete the ozone layer, known as 'ozone-depleting substances.'

These include chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HFCs), and halon gases, which are found in refrigerators, deodorants, and other industrial operations.

Since the agreement's implementation in 1989, global emissions of ozone-depleting chemicals have decreased by more than 99% as manufacturers have replaced them with less damaging substitutes.

Timeline

1974: American chemists uncover the link between CFCs and stratospheric ozone breakdown. 1985: British scientists reveal results of exceptionally low ozone concentrations above the Antarctic.

The Vienna Convention for the Protection of the Ozone Layer was signed in 1985; the Montreal Protocol on Substances that Deplete the Ozone Layer was signed in 1987; and the Ozone Protection and Synthetic Greenhouse Gas Management Act was enacted in 1989.

The phase-out of CFCs (chlorofluorocarbons) begins in 1991.

The phase-out of HCFCs (hydrochlorofluorocarbons) begins in 1996.

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ByKavitha.. 😇


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