OZONE LAYER

HOW TO SAVE MOTHER

EARTH?

PRESENTED BY

RINKU BALAN.KMSc. COMPUTER SCIENCEST.JOSEPH’S COLLEGEIRINJALAKUDAKERALA

Ozone layer• The ozone layer or ozone shield refers to a region of Earth's stratosphere that absorbs most of the Sun's UV radiation.

• It protects humans and other organisms from the UV radiation.

• It absorbs 97-99% of the suns high frequency ultraviolet light which is potentially damaging to the life form on earth.

Ozone Depletion

Scientific evidence indicates that stratospheric ozone is being destroyed by a group of manufactured chemicals, containing chlorine and/or bromine. These chemicals are called "ozone-depleting substances" (ODS).

The main ODS are:• chlorofluorocarbons (CFCs)• hydrochlorofluorcarbons (HCFCs)• carbon tetrachloride • methyl chloroform• Halons (brominated fluorocarbons)

The Impacts of Ozone Depletion

Harm to human health.

• skin cancers, sunburns, cataracts, blindness.

Adverse impacts on agriculture, forestry and natural ecosystems.

• major crop species are resulting in reduced growth, photosynthesis and flowering.

Damage to marine life.

• plankton are threatened by increased UV radiation, reduce fish yields.

Animals

• In domestic animals, UV overexposure may cause eye and skin cancers.

HOW TO PROTECT THE OZONE LAYER ?

• Minimize high altitude aircraft flights (oxygen reduction and water vapor deposition)

• Minimize rocket flights (water vapor deposition)

• Encourage growth of plants that produce oxygen, discourage deforestation

• Decrease / control releases of high temperature steam / moisture to the atmosphere

• Eliminate production and release of known ozone depleting chemicals (such as CFCs and HCFCs) where remotely possible. Subsidize production of safer alternatives where possible.

• Try to use products which are labeled "Ozone-Friendly“.

• Ensure technicians repairing your refrigerator or air conditioner recover and recycle the old CFCs so they are not released into the atmosphere.

• Vehicle air conditioning units should regularly be checked for leaks.• Help start a refrigerant recovery and recycling program in your area if none already exists.

• Replace halon fire extinguishers with alternatives(e.g. carbon dioxide or foam).

THANK YOU