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As you can feel drastic breath taking heat during summer & chilly winds freezing your bones during winter.In This presentation we are going to discuss about~:: In This presentation we are going to discuss about ~: Global warming Main causes of global warming Why warming is bad? Other bad effects of warming How we are causing global warming? Bad effects of warming in future How to prevent global warming?Slide 5: 1Slide 6: Global Warming is an average increase in the temperature of the atmosphere near the Earth’s surface and in the troposphere What is global warming?Slide 7: 2Slide 8: Green House Effect Ozone Depletion Acid Rain Pollution Population Automobiles, Burning of fossil fuel s MAIN CAUSES OF GLOBAL WARMINGSlide 9: I nfrared radiation is absorbed by "greenhouse gases which slows its escape from the atmosphere. Greenhouse effectSlide 11: GREENHOUSE GASES~: Gas Formula Contribution (%) Water Vapor H 2 O 36 – 72 % Carbon Dioxide CO 2 9 – 26 % Methane CH 4 4 – 9 % Ozone O 3 3 – 7 %Slide 12: Water Vapor Ozone Methane Carbon dioxideSlide 13: 3Slide 14: What is Ozone Layer? Protective shield around earth which absorbs most of the UV-radiationsSlide 15: Ozone Depletion The CFC’s released from refrigeration systems, AC systems reacts with ozone gas and breaks large amount of ozone molecules thus reducing them in stratosphere .Slide 16: Consequences of ozone layer depletion leads to ~: skin cancer . cataracts A suppressed immune system. damage terrestrial plant life, single cell organisms, and aquatic ecosystems.Slide 17: 4Slide 18: ACID RAIN Acid rain is a form of air pollution in which air borne acids are produced this pollutes the air and becomes a reason for Global Warming .Slide 19: Consequences of acid rainSlide 20: it affects the photosynthesis process. Attacks directly on the leaves of plants Affects the various freshwater bodies Buildings & precious stone objects are weathered away.Slide 21: 5Slide 22: POLLUTION An undesirable change in the physical, chemical or biological characteristics of land water and air. Sources of pollution Natural causes Man-made causesSlide 23: NATURAL CAUSES OF GLOBAL WARMINGSlide 24: VOLCANIC ERRUPTIONSlide 25: FOREST FIRESSlide 26: DECAY OF ORGANIC AND INORGANIC SUBSTANCESSlide 27: DUST STORMS & STRONG WINDSSlide 28: MAN-MADE CAUSES OF GLOBAL WARMINGSlide 29: INDUSTRIESSlide 30: AUTOMOBILESSlide 31: Thermal power plantsSlide 32: AGRICULTURESlide 33: BURNING OF WASTESlide 34: 6Slide 35: POPULATION Increasing population is the only factor for rising demand of energy.Slide 36: Overpopulation created environmental problems, climatic changes, atmospheric Pollution , water & energy cursity and nagging problems of waste disposal Consequences of overpopulationSlide 37: 7Slide 38: THE EFFECTS OF GLOBAL WARMINGSlide 39: Climate-sensitive diseases Increase the risk of some infectious diseases E.g . Malaria, dengue fever, yellow fever, encephalitis , cholera.Slide 40: Effects on Flora & Fauna Birds are laying eggs earlier than usual Plants are flowering earlier Mammals are breaking hibernation soonerSlide 41: If the present rate of release of greenhouse gases continues then the earth’s temperature would rise 1.4 to 5.8 degree Celsius by the year 2100 such melt a large portions of polar ice caps and several glaciers & cause floods. MELTING OF GLACIERS AND MORE FLOODSSlide 42: MELTING OF GLACIER AND MORE FLOODSSlide 43: Extreme Events Heat waves; Cold waves; More event-related deaths, injuries, infectious diseases, and stress-related disordersSlide 44: Air Quality An increase in the concentration of ground-level ozone Damage lung tissue Harmful for those with asthma and other chronic lung diseasesSlide 45: Food supply Rising temperatures and variable precipitation Decrease the production of staple foods in many of the poorest regions Increasing risks of malnutritionSlide 46: Population displacement Rising sea levels Increase the risk of coastal flooding (Necessitate population displacement)Slide 47: 8Slide 48: MEASURES TO CONTROL GLOBAL WARMINGSlide 49: Other bad effects of warming Affecting human health Destruction of natural habitat Depletion of wild food Loss of species Loss of crop by soil erosionSlide 50: Health & Global Warming can cause the loss of life. provides an ideal breeding environment for mosquitoes. increase pollution of water and air, which harms the human .Slide 51: Destruction of natural habitat EXAMPLE : over half of the original forest in the world has been converted to other uses.Slide 52: Depletion of wild food EXAMPLE : Over 2 billion people rely primarily on ocean fish for protein in diet; to date, an estimated 90% of ocean fish and shellfish stock has been depleted.Slide 53: Loss of species EXAMPLE: decline in bee population causes extinction of plants which are dependent on bees for pollination.Slide 54: Loss of crop by soil erosion EXAMPLE : erosion by wind and water from typical modern farm is 10-40x rate of soil formationSlide 55: 9Slide 56: NOW LET US SEE OUR FUTURESlide 57: OUR WARMING future Deaths from global warming will double in just 25 years, to 300,000 people a year. Global sea levels could rise by more than 20 feet with the loss of shelf ice. Heat waves will be more frequent and intense. More than a million species could be driven to extinction by 2050.Slide 58: 10Slide 59: Measures on controlling the problem Government * set some laws to limit the amount of pollutants produced by factories * develop the skills of using renewable fuels , e.g. solar energy, wind energy * encourage the factories to replace fossil fuels by renewable fuels, which would not cause environmental pollution * carry out energy saving scheme → reduce the pollution produced by burning fossil fuels * build more plants → reduce the pollutants e.g. CO2Slide 60: Measures on controlling the problem Citizens * reduce the use of plastic bags → as burning plastic emit CH4 * recycle the resources, e.g. plastic * reduce the use of sprays → as CFCs would be emitted out * reduce the use of air-conditioner, which will emit CFCs * use public transportation instead of private cars → reduce the pollutants emitted by carsSlide 61: Measures on controlling the problem STUDENTSSlide 62: STUDENTS You do not have the permission to view this presentation. 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