DEPLETION What is Ozone Two different layers in the atmosphere Troposphere Stratosphere What is ozone layer Ozone layer is a thin fragile shield that contains relatively high concentrations of ozone ID: 261251
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Slide1
OZONE LAYER
DEPLETIONSlide2
What is Ozone?Slide3Slide4Slide5
Two different layers in the atmosphere:
Troposphere
Stratosphere
Slide6
What is ozone layer?Slide7
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 sunSlide8
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.Slide9
Causes of Ozone DepletionSlide10
seasons
weather conditions, and
solar cycles
Natural FactorsSlide11
The main causes of why ozone layer is now being destroyed at a faster rate than it was being naturally produced are the….Slide12
Manufactured ChemicalsSlide13
Ozone layer is being destroyed by a group of manufactured chemicals that are called
ODS
or
Ozone-Depleting Substances.Slide14
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)Slide15
The Principal Steps in Stratospheric
Ozone Depletion
Caused by HumansSlide16
The Process of ODS Reaching the AtmosphereSlide17
Effects of Ozone DepletionSlide18
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 cancerSlide19
Reduced effectiveness of immune system
Respiratory illness and heart problemsSlide20
Effects on the Environment
Global warming
Climate change
Crop and forest damage
Infections and skin diseases on animals
Less ocean plankton
Less fish harvestSlide21
ImpactsSlide22
MitigationsSlide23
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 LayerSlide24
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 1999Slide25
Republic Act 9003 or the Ecological Solid Waste Management Act.
Presidential Decree 1144Slide26
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. Slide27
Conclusions
And
RecommendationsSlide28