what is ozone layer
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1,111,111 TRP = 11,111 USD
1,111,111 TRP = 11,111 USD
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The ozone layer is a protective shield in the Earth’s stratosphere, composed of ozone (O₃) molecules. It absorbs 97–99% of the Sun’s harmful ultraviolet (UV) radiation, safeguarding life from DNA damage, skin cancer, and ecosystem disruption.
Key Points:
Formation & Location:
Forms naturally when UV light splits oxygen (O₂), releasing single atoms that bond with O₂ to create O₃.
Concentrated 10–30 km above Earth, peaking at ~20 km.
Threats:
Human-made chemicals (e.g., CFCs in refrigerants/aerosols) break down ozone, causing seasonal “holes,” notably over Antarctica.
Climate change alters atmospheric circulation, affecting ozone distribution.
Recovery Efforts:
The Montreal Protocol (1987) phased out ozone-depleting substances, leading to gradual healing (1–3% recovery per decade).
Current Status:
Projected to return to 1980 levels by 2060s, but challenges like illegal CFC use and nitrous oxide emissions persist.
Why It Matters:
Without the ozone layer, UV-B radiation would disrupt agriculture, marine plankton (the base of the food chain), and human health. Continued vigilance is vital to sustain progress