OZONE LAYER
- 1. PRESENTED BY RINKU BALAN.K MSc. COMPUTER SCIENCE ST.JOSEPH’S COLLEGE IRINJALAKUDA KERALA
- 2. 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.
- 3. 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)
- 4. 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.
- 5. 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.
- 7. • 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.
- 8. • 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).