Daily Current Affairrs Update: 18 JAN 2023

Recovery of Ozone Layer

According to a new U.N. report, earth’s protective ozone layer is slowly but noticeably healing at a pace that would fully mend the hole over Antarctica in about 43 years.

What are the Findings of the Report?

Scientists warned of the detrimental effects of geoengineering technologies.
Aerosol sprays, like other commonly used substances such as dry-cleaning solvents, refrigerants and fumigants, contain Ozone-Depleting Substances (ODS) including chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs), halons, methyl bromide, carbon tetrachloride, and methyl chloroform.
Scientific Assessment Panel examined the potential effects on ozone of the intentional addition of aerosols.
SAI (Stratospheric Aerosol Injection) can increase sunlight reflection, thereby lowering the amount of heat that enters the troposphere. But this method “could also affect stratospheric temperatures, circulation and ozone production and destruction rates and transport".

What are the Key Facts about Ozone?

Special form of oxygen with the chemical formula O3.
90% of ozone occurs naturally in the Earth's upper atmosphere (Stratosphere).
“Good” ozone is gradually being destroyed by man-made chemicals referred to as ODS, including CFCs, HCFCs, halons, methyl bromide.
Ozone layer depletion leads to an uptick in the incidence of skin cancer and cataracts in humans.

What are the Related Steps taken?

Montreal Protocol
Vienna Convention

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