Ozone layer depletion
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The document discusses the ozone layer and the factors contributing to its depletion. It notes that the ozone layer shields the Earth from UV radiation and was discovered to be depleting in the 1970s. Various manufactured chemicals called ozone-depleting substances (ODS), such as CFCs, are the main cause of this depletion. Depletion of the ozone layer leads to increased UV radiation reaching the Earth's surface and negative effects on both human health and ecosystems. International agreements like the Montreal Protocol have implemented policies to mitigate ozone depletion.
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Ozone layer depletion ppt
The document discusses the ozone layer and the factors contributing to its depletion. It notes that the ozone layer shields the Earth from UV radiation and was discovered to be depleting in the 1970s due to ozone-depleting substances (ODS) released into the atmosphere. The main ODS that damage the ozone layer are listed. The text then outlines the principal steps in how ODS reach the stratosphere and cause ozone depletion, as well as the human health and environmental effects of increased UV exposure due to ozone layer thinning. International agreements like the Montreal Protocol and domestic policies in countries like the Philippines are mentioned as mitigation efforts to prevent further ozone depletion.
1987 montreal protocol on substances that deplete the
The 1987 Montreal Protocol addressed growing concern over depletion of the stratospheric ozone layer by man-made compounds. It established a framework for phasing out the production and consumption of ozone depleting substances like chlorofluorocarbons and halons. The protocol was amended in 1990, 1992, and 1997 to accelerate schedules and include more substances. It has been highly effective, with the ozone layer expected to recover by the 2060s due to compliance with the Montreal Protocol.
International ozone day
International Ozone Day is presented to discuss the ozone layer and the threats to it. The ozone layer protects life on Earth by absorbing ultraviolet radiation from the sun. Chlorofluorocarbons (CFCs) released into the atmosphere were depleting the ozone layer. This led to the discovery of the ozone hole over Antarctica in 1985. In response, the Montreal Protocol was established in 1987 to phase out the production of ozone-depleting substances and allow the ozone layer to recover by 2050 to 2075.
Siminari pollution.(ozone layer depletion)
The document discusses the composition and layers of the atmosphere, with a focus on the ozone layer. It describes the ozone layer as a concentration of ozone molecules in the stratosphere that protects the Earth from ultraviolet radiation. It then explains that chlorofluorocarbons released from human activities were depleting the ozone layer by releasing chlorine atoms that break down ozone molecules. While regulations have led to a reduction in ozone-depleting substances, full recovery of the ozone layer is not expected until around 2050.
montreal protocol what was it ?
The document summarizes a seminar report on ozone layer depletion and the Montreal Protocol. It discusses how the ozone layer was discovered and its importance in shielding Earth from UV rays. It then explains how CFCs and other ozone depleting substances released from industrial activities were depleting the ozone layer, leading to the formation of an ozone hole over Antarctica. The Montreal Protocol of 1989 was a major international agreement to phase out the production of CFCs and other ozone depleting substances to allow the ozone layer to recover.
Ozone Depletion and the Montreal Protocol
The document discusses the Montreal Protocol, an international agreement signed in 1987 to reduce ozone depletion. It outlines that CFCs and other chemicals were destroying the ozone layer, which protects life on Earth from UV radiation. The Protocol set limits on ozone depleting substances and has led to a decrease in their atmospheric levels and early signs of ozone layer recovery, making it one of the most successful international environmental agreements.
Ozone depletion potential of different refrigerants
The document discusses ozone depletion potential of different refrigerants and the mechanisms by which CFCs and HCFCs damage the ozone layer when they reach the stratosphere. It explains that chlorine atoms released from these refrigerants can break down over 100,000 ozone molecules each. It also provides details on common types of refrigerants like CFCs, HCFCs, HFCs and their ozone depletion potentials.
world ozone day
World Ozone Day is celebrated annually on September 16th to raise awareness of ozone layer depletion. The 1995 theme was "Caring for all life under the sun". Frank Rowland, Mario Molina, and Paul Crutzen were awarded the 1995 Nobel Prize in Chemistry for their research showing that CFCs deplete stratospheric ozone. Ozone depletion leads to increased UV radiation exposure which harms human health, crops, and ecosystems. The Montreal Protocol was adopted in 1987 to phase out ozone depleting substances and has been successful in stabilizing ozone layer recovery.
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Ozone layer depletion ppt
The document discusses the ozone layer and the factors contributing to its depletion. It notes that the ozone layer shields the Earth from UV radiation and was discovered to be depleting in the 1970s due to ozone-depleting substances (ODS) released into the atmosphere. The main ODS that damage the ozone layer are listed. The text then outlines the principal steps in how ODS reach the stratosphere and cause ozone depletion, as well as the human health and environmental effects of increased UV exposure due to ozone layer thinning. International agreements like the Montreal Protocol and domestic policies in countries like the Philippines are mentioned as mitigation efforts to prevent further ozone depletion.
1987 montreal protocol on substances that deplete the
The 1987 Montreal Protocol addressed growing concern over depletion of the stratospheric ozone layer by man-made compounds. It established a framework for phasing out the production and consumption of ozone depleting substances like chlorofluorocarbons and halons. The protocol was amended in 1990, 1992, and 1997 to accelerate schedules and include more substances. It has been highly effective, with the ozone layer expected to recover by the 2060s due to compliance with the Montreal Protocol.
International ozone day
International Ozone Day is presented to discuss the ozone layer and the threats to it. The ozone layer protects life on Earth by absorbing ultraviolet radiation from the sun. Chlorofluorocarbons (CFCs) released into the atmosphere were depleting the ozone layer. This led to the discovery of the ozone hole over Antarctica in 1985. In response, the Montreal Protocol was established in 1987 to phase out the production of ozone-depleting substances and allow the ozone layer to recover by 2050 to 2075.
Siminari pollution.(ozone layer depletion)
The document discusses the composition and layers of the atmosphere, with a focus on the ozone layer. It describes the ozone layer as a concentration of ozone molecules in the stratosphere that protects the Earth from ultraviolet radiation. It then explains that chlorofluorocarbons released from human activities were depleting the ozone layer by releasing chlorine atoms that break down ozone molecules. While regulations have led to a reduction in ozone-depleting substances, full recovery of the ozone layer is not expected until around 2050.
montreal protocol what was it ?
The document summarizes a seminar report on ozone layer depletion and the Montreal Protocol. It discusses how the ozone layer was discovered and its importance in shielding Earth from UV rays. It then explains how CFCs and other ozone depleting substances released from industrial activities were depleting the ozone layer, leading to the formation of an ozone hole over Antarctica. The Montreal Protocol of 1989 was a major international agreement to phase out the production of CFCs and other ozone depleting substances to allow the ozone layer to recover.
Ozone Depletion and the Montreal Protocol
The document discusses the Montreal Protocol, an international agreement signed in 1987 to reduce ozone depletion. It outlines that CFCs and other chemicals were destroying the ozone layer, which protects life on Earth from UV radiation. The Protocol set limits on ozone depleting substances and has led to a decrease in their atmospheric levels and early signs of ozone layer recovery, making it one of the most successful international environmental agreements.
Ozone depletion potential of different refrigerants
The document discusses ozone depletion potential of different refrigerants and the mechanisms by which CFCs and HCFCs damage the ozone layer when they reach the stratosphere. It explains that chlorine atoms released from these refrigerants can break down over 100,000 ozone molecules each. It also provides details on common types of refrigerants like CFCs, HCFCs, HFCs and their ozone depletion potentials.
world ozone day
World Ozone Day is celebrated annually on September 16th to raise awareness of ozone layer depletion. The 1995 theme was "Caring for all life under the sun". Frank Rowland, Mario Molina, and Paul Crutzen were awarded the 1995 Nobel Prize in Chemistry for their research showing that CFCs deplete stratospheric ozone. Ozone depletion leads to increased UV radiation exposure which harms human health, crops, and ecosystems. The Montreal Protocol was adopted in 1987 to phase out ozone depleting substances and has been successful in stabilizing ozone layer recovery.
Ozone Layer Depletion
The ozone layer is a thin part of the stratosphere that protects the Earth from harmful UV radiation from the sun. It contains high concentrations of ozone which absorbs most UV radiation. Ozone depletion is caused by ozone-depleting substances like CFCs releasing chlorine and bromine atoms that destroy ozone. This allows more UV radiation to reach the Earth's surface and increases risks of skin cancer, eye cataracts, and harm to plants and animals. International agreements like the Montreal Protocol phased out most ozone-depleting substances, and models predict the ozone layer will recover by 2050-2075.
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World ozone day presentation
The document discusses the ozone layer, its importance in protecting life from UV radiation, and threats to its integrity. It notes that the ozone layer is found in the stratosphere and filters out much of the sun's harmful UV rays. It then explains how CFCs and other ozone depleting substances released chemicals that break down the ozone layer when they reach the stratosphere. The largest ozone hole is observed annually over Antarctica in spring due to chemical reactions on polar stratospheric clouds. The Montreal Protocol was enacted to phase out ozone depleting substances and has led to signs of recovery in the ozone layer.
Ozone layer depletion
Hello I am presenting before you a presentation on ozone layer depletion which includes the mechanism of it and even the detailed information about how they occur.Hope it will be helpful to the students in understanding the ozone layer depletion.
Thank You,
Tirthankar Majumder
MTech
Dept. of earth and environmental science
NIT- Durgapur
World ozone day 16th september By Mr.Allah Dad Khan Visiting Professor The U...
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The document discusses ozone depletion and the formation of the ozone layer. It provides details on the following:
1) The ozone layer is found in the stratosphere between 10-50km above the ground. It protects the earth from harmful UV radiation.
2) Ozone is formed through a reaction where oxygen molecules are split by UV light into atomic oxygen, which then combines with other oxygen molecules to form ozone.
3) Chlorofluorocarbons (CFCs) were widely used but are now known to destroy ozone. CFCs release chlorine atoms that catalyze the breakdown of ozone into oxygen. Depletion is now severe over Antarctica.
4)
Pollution
Man has polluted the lithosphere, hydrosphere, and atmosphere through interference with natural processes and use of biological and physical resources. The document defines key terms like biosphere, ecosystem, atmosphere, and different types of pollution like primary and secondary pollutants. It discusses several types of environmental challenges caused by pollution, including greenhouse effect, ozone depletion, acid rain, smog, and their impacts on climate change, increased UV radiation, soil and plant damage. The conclusion emphasizes that while a certain environment is essential for human survival, industrialization has also increased environmental hazards like air, water, and noise pollution, causing health problems.
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The document discusses ozone depletion and its impacts. It defines the ozone layer and explains its importance in protecting life on Earth from UV radiation. Ozone depletion occurs when chlorofluorocarbons (CFCs) released into the atmosphere break down ozone molecules. This allows more UV radiation to reach the surface, affecting global warming, human health, agriculture, and marine ecosystems. The document traces the history of ozone depletion research and international agreements like the Montreal Protocol to regulate CFC emissions and limit further damage to the ozone layer.
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The document discusses ozone depletion and the formation and importance of the ozone layer. It explains that CFCs released into the atmosphere were depleting the ozone layer and increasing UV radiation reaching the Earth's surface. This poses risks to human health through higher rates of skin cancer and to food supplies and other animal populations. The Montreal Protocol was adopted in 1987 to phase out CFC production and help restore the ozone layer, though it will take decades for effects to be reversed.
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The ozone layer is a layer in the stratosphere between 20-30 km above the Earth's surface that contains 90% of the atmosphere's ozone. Ozone is formed through the Chapman cycle where oxygen is converted to ozone via ultraviolet radiation. Ozone depletion occurs when gases like CFCs and halons react with ozone due to UV radiation, forming chlorine atoms that can destroy 100,000 ozone molecules each. This causes thinning of the ozone layer, known as the ozone hole over Antarctica. Ozone depletion leads to increased UV radiation reaching the Earth, harming humans, animals, plants and contributing to global warming. International agreements like the Montreal Protocol aim to phase out ozone depleting
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The document discusses the ozone layer in the Earth's stratosphere that protects the planet from harmful UV radiation. It is formed through a reaction involving oxygen and ultraviolet light. While ozone itself is poisonous at ground level, the ozone layer is beneficial as it prevents excessive UV radiation from reaching the surface and causing issues like skin cancer. However, the ozone layer is under threat due to ozone depleting substances released into the atmosphere such as CFCs, halons, HCFCs, and methyl chloroform which are used in products like refrigerants and aerosol sprays.
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ozone depletion
more chemistry contents are available
1. pdf file on Termmate: https://www.termmate.com/rabia.aziz
2. YouTube: https://www.youtube.com/channel/UCKxWnNdskGHnZFS0h1QRTEA
3. Facebook: https://web.facebook.com/Chemist.Rabia.Aziz/
4. Blogger: https://chemistry-academy.blogspot.com/
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• Ozone–oxygen cycle
Chapman cycle
• Ozone Depletion
• Ozone Hole
• Effect Of Ozone Depletion
• Solution
• World Ozone Day
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The document discusses ozone depletion and its causes and consequences. It explains that ozone in the stratosphere protects the Earth from ultraviolet radiation, but chlorofluorocarbons released into the atmosphere break down into chlorine which destroys ozone molecules. This causes the ozone layer to thin, leaving it unable to fully screen ultraviolet rays. If the ozone layer is depleted faster than it can recover, an "ozone hole" forms. The thinning ozone allows more ultraviolet radiation to reach the Earth's surface, increasing health and environmental risks like skin cancer and disruption of marine and terrestrial ecosystems.
Ozone- A wonder umbrella
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Compares the science, causes & impacts of climate change & ozone depletion. What made ozone depletion a much easier problem to address than climate disruption?Ozone Report.ppt-141215144736-conversion-gate01
The document discusses the history and formation of the ozone layer, as well as causes and effects of ozone depletion. It notes that ozone plays a key role in absorbing ultraviolet radiation from the sun. However, activities releasing chlorofluorocarbons and other chemicals into the atmosphere have depleted the ozone layer, especially over Antarctica and the Arctic. This ozone depletion allows more harmful UV radiation to reach the Earth's surface, threatening human health, agriculture and ecosystems. International agreements like the Montreal Protocol have aimed to phase out ozone depleting substances to allow the ozone layer to recover.
Ozone layer
The document discusses the ozone layer, its formation and depletion over time. Some key points:
- The ozone layer is found 20-30km above the Earth's surface and absorbs UV radiation.
- Depletion is caused mainly by CFCs and halogen gases, which are broken down by UV rays to release chlorine atoms that destroy ozone.
- Significant ozone depletion up to 50% has been observed over the Antarctic region, known as the ozone hole.
- Effects of depletion include increased UV rays reaching the Earth's surface, which can harm plants, marine life, and increase skin cancer risks in humans.
- International agreements like the Montreal Protocol have led
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The document discusses the ozone layer, its importance in protecting life from UV radiation, and threats to its integrity. It notes that the ozone layer is found in the stratosphere and filters out much of the sun's harmful UV rays. It then explains how CFCs and other ozone depleting substances released chemicals that break down the ozone layer when they reach the stratosphere. The largest ozone hole is observed annually over Antarctica in spring due to chemical reactions on polar stratospheric clouds. The Montreal Protocol was enacted to phase out ozone depleting substances and has led to signs of recovery in the ozone layer.
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Hello I am presenting before you a presentation on ozone layer depletion which includes the mechanism of it and even the detailed information about how they occur.Hope it will be helpful to the students in understanding the ozone layer depletion.
Thank You,
Tirthankar Majumder
MTech
Dept. of earth and environmental science
NIT- Durgapur
World ozone day 16th september By Mr.Allah Dad Khan Visiting Professor The U...
World ozone day 16th september By Mr.Allah Dad Khan Visiting Professor The University of Agriculture Peshawar
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The document discusses ozone depletion and the formation of the ozone layer. It provides details on the following:
1) The ozone layer is found in the stratosphere between 10-50km above the ground. It protects the earth from harmful UV radiation.
2) Ozone is formed through a reaction where oxygen molecules are split by UV light into atomic oxygen, which then combines with other oxygen molecules to form ozone.
3) Chlorofluorocarbons (CFCs) were widely used but are now known to destroy ozone. CFCs release chlorine atoms that catalyze the breakdown of ozone into oxygen. Depletion is now severe over Antarctica.
4)
Pollution
Man has polluted the lithosphere, hydrosphere, and atmosphere through interference with natural processes and use of biological and physical resources. The document defines key terms like biosphere, ecosystem, atmosphere, and different types of pollution like primary and secondary pollutants. It discusses several types of environmental challenges caused by pollution, including greenhouse effect, ozone depletion, acid rain, smog, and their impacts on climate change, increased UV radiation, soil and plant damage. The conclusion emphasizes that while a certain environment is essential for human survival, industrialization has also increased environmental hazards like air, water, and noise pollution, causing health problems.
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The document discusses ozone depletion and its impacts. It defines the ozone layer and explains its importance in protecting life on Earth from UV radiation. Ozone depletion occurs when chlorofluorocarbons (CFCs) released into the atmosphere break down ozone molecules. This allows more UV radiation to reach the surface, affecting global warming, human health, agriculture, and marine ecosystems. The document traces the history of ozone depletion research and international agreements like the Montreal Protocol to regulate CFC emissions and limit further damage to the ozone layer.
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The document discusses ozone depletion and the formation and importance of the ozone layer. It explains that CFCs released into the atmosphere were depleting the ozone layer and increasing UV radiation reaching the Earth's surface. This poses risks to human health through higher rates of skin cancer and to food supplies and other animal populations. The Montreal Protocol was adopted in 1987 to phase out CFC production and help restore the ozone layer, though it will take decades for effects to be reversed.
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The ozone layer is a layer in the stratosphere between 20-30 km above the Earth's surface that contains 90% of the atmosphere's ozone. Ozone is formed through the Chapman cycle where oxygen is converted to ozone via ultraviolet radiation. Ozone depletion occurs when gases like CFCs and halons react with ozone due to UV radiation, forming chlorine atoms that can destroy 100,000 ozone molecules each. This causes thinning of the ozone layer, known as the ozone hole over Antarctica. Ozone depletion leads to increased UV radiation reaching the Earth, harming humans, animals, plants and contributing to global warming. International agreements like the Montreal Protocol aim to phase out ozone depleting
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The document discusses the ozone layer in the Earth's stratosphere that protects the planet from harmful UV radiation. It is formed through a reaction involving oxygen and ultraviolet light. While ozone itself is poisonous at ground level, the ozone layer is beneficial as it prevents excessive UV radiation from reaching the surface and causing issues like skin cancer. However, the ozone layer is under threat due to ozone depleting substances released into the atmosphere such as CFCs, halons, HCFCs, and methyl chloroform which are used in products like refrigerants and aerosol sprays.
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The document discusses ozone depletion and the ozone hole. It explains that ozone in the stratosphere protects the Earth from UV rays, but chlorofluorocarbons (CFCs) released from products like aerosol cans deplete the ozone layer. CFCs allow more UV rays to reach the Earth's surface. The document also describes the formation of the ozone hole over Antarctica, the steps of ozone depletion by CFCs, effects of increased UV exposure on humans and other organisms, and efforts to regulate CFCs to stop ozone depletion.
ozone depletion
more chemistry contents are available
1. pdf file on Termmate: https://www.termmate.com/rabia.aziz
2. YouTube: https://www.youtube.com/channel/UCKxWnNdskGHnZFS0h1QRTEA
3. Facebook: https://web.facebook.com/Chemist.Rabia.Aziz/
4. Blogger: https://chemistry-academy.blogspot.com/
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World ozone day 16th september By Mr.Allah Dad Khan Visiting Professor The U...
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- Significant ozone depletion up to 50% has been observed over the Antarctic region, known as the ozone hole.
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The document discusses ozone depletion and the ozone layer. It defines ozone and how it forms, and describes the ozone layer's location and role in protecting the Earth. It then discusses the discovery of the ozone hole, the causes of ozone depletion including CFCs, and solutions implemented through the Montreal Protocol to phase out ozone-depleting substances and allow the ozone layer to recover by 2050.
Greenhouse effect global worming
Ozone layer depletion occurs when ozone-depleting substances like CFCs break down ozone molecules in the stratosphere. This allows more ultraviolet radiation to reach the Earth's surface, increasing health and environmental risks. The ozone hole was first detected in 1975 and grew substantially in size through the 1980s and 1990s before stabilizing due to the Montreal Protocol banning CFCs. Global warming occurs when greenhouse gases like carbon dioxide trap heat in the lower atmosphere, increasing average surface and lower atmospheric temperatures globally over long periods of time. Both phenomena pose risks but international agreements have led to reductions in their drivers.
Biology Form 4 Chapter 9 : 9.2-9.3 Endangered Ecosystem
This document discusses endangered ecosystems and the depletion of the ozone layer. It explains that CFCs released into the atmosphere rise to the stratosphere where they destroy ozone molecules, creating a hole in the ozone layer. This thinning of the ozone layer allows more UV radiation to reach the Earth's surface, increasing health risks like skin cancer. International agreements like the Montreal Protocol have led countries to reduce CFC use and find alternatives to protect the ozone layer over time. Loss of habitat and overhunting have also endangered many species, so conservation efforts aim to preserve biodiversity through protected areas and sustainable use of resources.
Ozone depletion
The document discusses the history of ozone depletion, including the discovery of the ozone layer's protective function and the role of CFCs in damaging it. It describes how scientists in the 1970s hypothesized that CFCs could deplete stratospheric ozone, leading some countries to ban non-essential CFC uses in the late 1970s. The 1987 Montreal Protocol established an international agreement to phase out CFCs, though challenges remain regarding other ozone-depleting substances like methyl bromide. Coordinated global action and the development of alternatives have slowed ozone depletion, but full recovery is not expected until around 2050.
Ozone Depletion Potential of Different Refrigerants
Ozone depletion occurs when CFCs and HCFCs released into the atmosphere reach the stratosphere. Ultraviolet radiation causes these compounds to break down and release chlorine atoms which then catalyze the breakdown of over 100,000 ozone molecules each. International agreements like the Montreal Protocol have led countries to phase out ozone depleting substances and strengthen protections for the ozone layer.
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Ozone layer depletion
- 1. 1. • Troposphere• Stratosphere 2. • 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 3. • 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 layeris being depleted. 4. • seasons• weather conditions, and• solar cycles 5. Ozone layer is being destroyed by a group of manufactured chemicals that are called ODS or Ozone-Depleting Substances. 6. 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)• Hydro chloroluoo carbons (HCFC 22 and HCFC123) 7. The Principal Steps in Stratospheric Ozone Depletion Caused by Humans Emissions Accumulation Transportation Chemical Removal Conversion Reaction 8. The Process of ODS Reaching the Atmosphere 9. The effect of ozone depletion isthe increased UV-B radiation reaching Earth’s surface.Effects on Humans• Sunburn•Sun-damaged skin•Cataracts•Snow blindness•Skin cancer 10. • Reduced effectiveness ofimmune system• Respiratory illness and heart problems 11. Effects on the Environment• Global warming• Climate change• Crop and forest damage• Infections and skin diseases on animals• Less ocean plankton• Less fish harvest 12. Marine Terrestrial HumansEcosystems Ecosystems Air Quality Materials 13. Mitigations 14. When an ozone hole was discovered,several countries unite to prevent thecontinuous depletion of the ozone layer by implementing policies and other preventivemeasures.• The Montreal Protocol on Substancesthat Deplete the Ozone Layer 15. Philippines’ Laws and Policies• Republic Act 6969 or the ToxicSubstances and Hazardous andNuclear Wastes Control Act.• Republic Act 8749 or thePhilippine Clean Air Act of 1999 16. • Republic Act 9003 or the Ecological SolidWaste Management Act.• Presidential Decree 1144 17. Davao City has also implementedmitigating measures. The LocalGovernment implemented the Davao CityEcological Solid Waste ManagementOrdinance 2009 (Section 7, Article 5 of theOrdinance 0361 series of 2010) - that provides the use of recyclable,biodegradable or reusable containers asfood and beverage parcels started 28 June2012. 18. Be informed Be Understandreminded Sustainable developmentFollow Know our responsibilities Educate ourselves