Download - Ozone layer depletion ppt
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OZONE LAYER DEPLETION
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What is Ozone?
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Two different layers in the atmosphere:
• Troposphere• Stratosphere
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What is ozone layer?
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• Ozone layer is a thin, fragile shield that contains relatively high concentrations of ozone.
• It shields the entire Earth from much of the harmful UV radiation that comes from the sun
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• Damage in the ozone layer will naturally mean the entry of harmful rays in to the atmosphere.
• In the 1970s, the scientists discovered that the ozone layer is being depleted.
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Causes of Ozone Depletion
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• seasons
• weather conditions, and
• solar cycles
Natural Factors
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The main causes of why ozone layer is now being destroyed at a faster rate than it was being naturally produced are the….
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Manufactured Chemicals
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Ozone layer is being destroyed by a group of
manufactured chemicals that are called ODS or Ozone-Depleting Substances.
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The main ODS are the following:
• Chlorofluorocarbons (CFC 11, CFC 12, CFC 13)
• Methyl bromide (CH3Br)
• Halons (halon-1211, halon-1301, halon-2402)
• Carbon tetrachloride (CCI4)
• Hydrochloroluorocarbons (HCFC 22 and HCFC 123)
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Emissions Accumulation
Transportation
ConversionChemical Reaction
Removal
The Principal Steps in Stratospheric Ozone Depletion Caused by Humans
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The Process of ODS Reaching the Atmosphere
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Effects of Ozone Depletion
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The effect of ozone depletion is the increased UV-B radiation reaching Earth’s surface.
Effects on Humans• Sunburn•Sun-damaged skin•Cataracts•Snow blindness•Skin cancer
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• Reduced effectiveness of immune system
• Respiratory illness and heart problems
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Effects on the Environment
• Global warming• Climate change• Crop and forest damage• Infections and skin diseases on animals• Less ocean plankton• Less fish harvest
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Marine Ecosystems Humans
Terrestrial Ecosystems
Air Quality
Materials
Impacts
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Mitigations
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When an ozone hole was discovered, several countries unite to prevent the continuous depletion of the ozone layer by implementing policies and other preventive measures.
• The Montreal Protocol on Substances that Deplete the Ozone Layer
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Philippines’ Laws and Policies
• Republic Act 6969 or the Toxic Substances and Hazardous and Nuclear Wastes Control Act.
• Republic Act 8749 or the Philippine Clean Air Act of 1999
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• Republic Act 9003 or the Ecological Solid Waste Management Act.
• Presidential Decree 1144
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Davao City has also implemented mitigating measures. The Local Government implemented the Davao City Ecological Solid Waste Management Ordinance 2009 (Section 7, Article 5 of the Ordinance 0361 series of 2010)
- that provides the use of recyclable, biodegradable or reusable containers as food and beverage parcels started 28 June 2012.
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Conclusions And
Recommendations
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Sustainable
development