Brief Context
In News The Antarctic ozone hole that formed in August 2025 closed earlier than usual, offering hope for recovery amid record global warming. What is the Ozone Hole? It is a seasonal thinning of the stratospheric ozone layer particularly in the southern polar region — was first discovered in 1985.
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Syllabus: GS3/Environment
In News
- The Antarctic ozone hole that formed in August 2025 closed earlier than usual, offering hope for recovery amid record global warming.
What is the Ozone Hole?
- It is a seasonal thinning of the stratospheric ozone layer particularly in the southern polar region — was first discovered in 1985.
- The ozone hole is not technically a “hole” where no ozone is present, but is actually a region of exceptionally depleted ozone in the stratosphere over the Antarctic .
- It happens at the beginning of the Southern Hemisphere spring (August–October).
Causes
- Chlorofluorocarbons (CFCs), halons, and other ozone-depleting substances (ODS): These chemicals, once widely used in refrigeration, aerosols, and solvents, break down ozone molecules in the stratosphere.
- Polar stratospheric clouds (PSCs) formed in extreme cold, they accelerate chemical reactions that destroy ozone.
- Climate change interactions: Warming at the surface and cooling in the stratosphere can influence ozone depletion cycles.
Impacts
- Human health: Increased ultraviolet (UV-B) radiation leads to higher risks of skin cancer, cataracts, and weakened immune systems.
- Ecosystems: UV radiation damages phytoplankton, the base of marine food chains, and affects crop yields.
- Climate linkages: Ozone depletion alters atmospheric circulation, impacting weather patterns in the Southern Hemisphere.
Steps Taken
- Montreal Protocol (1987): It is a landmark global treaty banning ozone-depleting substances (ODS), credited with reducing ozone hole size.
- Kigali Amendment (2016) extended controls to hydrofluorocarbons (HFCs), potent greenhouse gases.
- National efforts: Countries phased out CFCs in refrigeration and aerosols, promoting safer alternatives.
Way Ahead
- The ozone hole story is a rare example of successful global environmental action, demonstrating that coordinated efforts can reverse ecological damage.
- However, recovery remains fragile and requires ongoing vigilance.
- Continued enforcement of the Montreal Protocol, alignment with climate policies, and promotion of sustainable, eco-friendly technologies are essential to protect the ozone layer.
- With sustained global cooperation, scientists estimate full recovery could occur by 2060–2070.
Source :DTE