Environmenta lissues Muhammad Fahad Ansari 12IEEM14


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Environmenta lissues Muhammad Fahad Ansari

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Environmenta lissues Muhammad Fahad Ansari 12IEEM14

  1. 1. Muhammad Fahad Ansari 12IEEM14
  2. 2. A variety of environmental problems now affect our entireworld. As globalization continues and the earths naturalprocesses transform local problems into international issues,few societies are being left untouched by majorenvironmental problems.Some of the largest problems now affecting the world are:Acid Rain, Air Pollution, Global Warming, Hazardous Waster,Ozone Depletion, Smog, Water Pollution, Overpopulation,and Rain Forest Destruction.
  3. 3. Acid RainThe term acid rain refersto what scientists callacid deposition. It iscaused by airborne acidicpollutants and has highlydestructive results.Acid rain, one of the mostimportant environmentalproblems of all, cannot beseen. The invisible gasesthat cause acid rainusually come fromautomobiles or coal-burning power plants.
  4. 4. The primary causes of acid rain are sulphur dioxide and nitrogenoxides. These chemicals are released by certain industrialprocesses, and as a result, the more industrialized nations ofEurope as well as the US suffer severely from acid rain.Most sulphur dioxide comes from power plants that use coal astheir fuel. These plants emit 100 million tons of sulphurdioxide, 70% of that in the world.Automobiles produce about half of the worlds nitrogenoxide. As the number of automobiles in use increases, so doesthe amount of acid rain. Power plants that burn fossil fuels alsocontribute significantly to nitrogen oxide emission.
  5. 5. Though human causes are thousands of miles. Eventually,primarily responsible for acid the particles will combine withrain, natural causes exist as other compounds to producewell. Fires, volcanic eruptions, new, often harmful, chemicals.bacterial decomposition, andlightening also greatly increase Acid rain comes down to thethe amount of nitrogen oxide on earth in the form of rain, snow,the planet. However, even the hail, fog, frost, or dew. Once itgigantic explosion of Mt. St. reaches the ground, the acidity inHelens released only about what the substance can harm and evenone coal power plant emits in a destroy both natural ecosystemsyear. and man-made products, such asOnce the tiny pollutant car finishes.molecules have entered theatmosphere, they can travel for
  6. 6. Acid rain is having harmful effects both on people and on thenatural ecosystems of the world. Scientists today are convincedthat acid rain is severe in many areas, and that it is having anadverse effect on the environments of those locations. Acid Rain Affect Aquatic Ecosystem Many ecosystems are affected by acid rain. Bodies of water, such as lakes and rivers, see many of their inhabitants die off due to rising acidity levels.
  7. 7. Acid Rain Effect on Trees and PlantsAside from aquatic bodies, acid deposition can significantlyimpact forests. As acid rain falls on trees, it can make themlose their leaves, damage their bark, and stunt their growth.By damaging these parts of the tree, it makes themvulnerable to disease, extreme weather, and insects. Acidfalling on a forest’s soil is also harmful because it disruptssoil nutrients, kills microorganisms in the soil, and cansometimes cause a calcium deficiency. Trees at highaltitudes are also susceptible to problems induced by acidiccloud cover as the moisture in the cloudsblankets them.
  8. 8. Finally, acid deposition also has an impact onarchitecture and art because of its ability to corrodecertain materials. As acid lands on buildings(especially those constructed with limestone) it reactswith minerals in the stones sometimes causing it todisintegrate and wash away. Acid deposition can alsocorrode modern buildings, cars, railroad tracks,airplanes, steel bridges, and pipesabove and below ground.
  9. 9. Modern science has proven that acid rain is a dangerousand highly destructive problem. As a result, various ways tolimit acid rain have been invented, and some are now being used. There are many ways that power plant companies like Northern States can reduce acid rain creation. They can use coal with a low sulphur content, they can remove the sulphur from smoke their plants release, and they can limit processes known to generate high levels of acid rain. Policy makers and environmental experts are now looking into the best methods to limit acid rain.
  10. 10. Environmentalists advocate the installation ofsulphur cleaning scrubbers in factories, washingsulphur out of coal, and finding new methods ofburning coal. Power plant operators are looking forless expensive solutions to the problem.Individuals can help by conserving energy or drivingtheir cars less. Governments can pass lawsrestricting pollution levels, or can use a variety ofmethods such as tradable emission permits to reduceacid rain. Whatever way it is done, acid rain willcertainly have to be limited in the future.
  11. 11. Every day, the average person inhales about 20,000 liters of air. Every time we breathe, we risk inhaling dangerous chemicals that have found their way into the air.Air pollution includes all contaminants found in the atmosphere. These dangerous substances can be either in the form of gases or particles.
  12. 12.  producing increasingAir pollution can be found amounts of pollution as both outdoors and time has progressed, indoors. Pollutants can and they now account be trapped inside for the majority of buildings, causing indoor pollution that pollutants released into lasts for a long time. the air.The sources of air pollution are both natural and human-based. As one might expect, humans have been
  13. 13. Industrialization set in motion the widespread use of fossil fuels which are now the main drivers of pollution as we know it.
  14. 14. Population growth causes the demand for food and other goods to go up, which is met by expanded production and use of natural resources. This then leads to higher levels of atmospheric pollution.
  15. 15. Globalization has in a way become a facilitator of air pollution. Big industry takes advantage of lax environmental controls in developing nations and moves its manufacturing facilities to such “pollution havens” from where air pollution travels around the world without any obstacles.
  16. 16. Of course, atmospheric pollution would not be such abig problem if it weren’t for its harmful effects onhumans, animals, trees and the wider environment.We can distinguish between short-term acute effectsand long-term chronic effects of air pollution.Air pollutants enter the body primarily through therespiratory system which thus becomes their mainvictim.Each air pollutant exerts their own specific adverseimpacts, ranging from mild to really damaging.
  17. 17. Air pollution has many disastrous effects that need to be curbed. Inorder to accomplish this, governments, scientists and environmentalistsare using or testing a variety of methods aimed at reducing pollution.There are two main types of pollution control.Input control involves preventing a problem before it occurs, or atleast limiting the effects the process will produce.Five major input control methods exist. People may try to restrictpopulation growth use less energy, improve energy efficiency, reducewaste, and move to non-polluting renewable forms of energyproduction. Also, automobile-produced pollution can be decreasedwith highly beneficial results.
  18. 18. Output control, the opposite method, seeks to fix the problemscaused by air pollution. This usually means cleaning up an area thathas been damaged by pollution.Input controls are usually more effective than outputcontrols. Output controls are also more expensive, making them lessdesirable to tax payers and polluting industries.Current air pollution control efforts are not all highly effective. Inwealthier countries, industries are often able to shift to methods thatdecrease air pollution. In the United States, for example, airpollution control laws have been successful in stopping air pollutionlevels from rising. However, in developing countries and even incountries where pollution is strictly regulated, much more needs tobe done.
  19. 19.  Global warming, also known as the greenhouse effect, immediately received international attention. Scientists, environmentalists, and governments around the world took an interest in the subject. Global warming is called the greenhouse effect because the gases that are gathering above the earth make the planet comparable to a greenhouse. By trapping heat near the surface of the earth, the greenhouse effect is warming the planet and threatening the environment.
  20. 20. Global warming has a variety of causes. One of the largest factors contributing to global warming is the general problem of overpopulation and its many effects.
  21. 21.  Many different gases can increase the planets temperature. The number of different products and human activities that contribute to global warming are so numerous that finding solutions to the problem is very difficult. Using a refrigerator releases dangerous gases, turning on the lights requires energy from a power plant, and driving to work causes gas emissions from the car. Countless other normal activities lead to global warming.
  22. 22.  Though having an atmosphere is important, the greenhouse effect may be making it excessively thick. The levels of gases covering the Earth have soared with industrialization and developed countries now produce about 75% of greenhouse gases.
  23. 23.  The climate changes that will result from global warming are extremely difficult to predict. The weather is determined by so many factors that it is often compared to chaos by scientists. Changing the temperature will likely have some effect on the If temperatures do indeed rise planets weather, but significantly, the most important result would be that some just what that effect will portion of the polar icecaps be is nearly impossible would melt, raising global sea to predict. levels.
  24. 24.  The threat of global warming is among the most important of all modern environmental problems. There are a variety of ways of dealing with it, each attempting to combat one of the many causes of global warming. The problems that cause global warming include overpopulation, deforestation ozone depletion, garbage dumping, and many others. These all have unique solutions which are now being promoted by environmentalists.
  25. 25.  Certain laws and treaties are aimed at reducing the emission of pollutants that result in global warming. In 1988, the International Conference on the Changing Atmosphere drew scientists and decision makers from 48 countries. Some policies could successfully reduce global warming. Raising fossil fuels, taxing emissions, and encouraging people to take environmentally friendly action through such activities as planting trees will all help. Because many problems leading to global warming are caused or contributed to by overpopulation, people are beginning to work to reduce family sizes. Family planning services actually help in the fight against global warming.
  26. 26. Education is a key method of reducing the greenhouse effect. By teaching people about such things as deforestation, environmental activists hope to prevent the problems that ultimately lead to global warming. Widespread media attention to the global warming problem is also increasing awareness. This is causing both individuals and governments to act more responsibly towards the environment.
  27. 27.  The rise in sea levels would be disastrous for some places. Islands would disappear, meaning their millions of inhabitants would have to relocate. Flooding would occur along coastlines all over the world, displacing more people and ruining cropland. In the case of major global warming and melted ice caps, some countries might simply cease to exist. Global warming, if uncontrolled, could cause a major catastrophe.
  28. 28.  The atmosphere and oceans are not the only parts of the environment being damaged. Rain forests are being quickly destroyed as well, and their survival is questionable. E.O. Wilson, a biologist at Harvard, called the depletion of rain forest areas "the greatest extinction since the end of the age of dinosaurs."
  29. 29. Guinea, Malaysia, Burma, Unlike some environmental the Philippines, Peru, issues, rain forest depletion has fortunately received Colombia, Bolivia, and significant public and Venezuela, rain forests media attention. that were once great have Despite the opposition to been lost. the cutting down of rain forests, the problem continues. Every year, Brazil chops down an area of forest the size of the state of Nebraska. In addition to the Amazons rain forests, many other forests are being cut down as well. In Indonesia, Zaire, Papua- New
  30. 30.  According to some consume. Limiting population estimates, 50 million acres of growth may be the rain forest are cut down first in a series of steps that every year. The United would limit the destruction of Nations says the figure is the rain forests. closer to 17 million acres. The World Wildlife Fund says that every minute, 25 to 50 acres are cut or burned to the ground. The worlds growing population has been a primary cause of rain forest destruction. More people need land to live on and wood products to
  31. 31. LoggingCommercial logging companies cut down mature trees that have been selected for their timber. The timber trade defends itself by saying that this method of selective logging ensures that the forest regrows naturally and in time, is once again ready for their safe logging practices (WWF). In most cases, this is untrue due to the nature of rainforests and of logging practices.
  32. 32. Solutions: For all purposes for whichtropical timber is used, other woods ormaterials could be substituted. We can stop using tropical timber andurge others to do the same. As long as thereis a market for tropical timbers, trees willcontinue to be cut down. Labeling schemes,aimed at helping consumers to choseenvironmental friendly timbers, are currentlybeing discussed in many countries.
  33. 33. Agriculture - Shifted CultivatorsShifted cultivators is theterm used for people whohave moved into rainforestareas and established small-scale farming operations.These are the landlesspeasants who have followedroads into already damagedrainforest areas. Theadditional damage they arecausing is extensive. Shiftedcultivators are currently beingblamed for 60% of tropicalforest loss (Colchester &Lohmann).
  34. 34.  shifted cultivators,The reason these people are moving into rainforestreferred to as shifted areas of which they hadcultivators is that most of no previous knowledgethem people have been in order to sustainforced off their own land. themselves and theirFor example, in Guatemala, families (Colchester &rainforest land was cleared Lohmann).for coffee and sugarplantations. The indigenouspeople had their land stolenby government andcorporations. They became
  35. 35. Solutions: Land reform isessential if this problem is to beaddressed. However, according toColchester and Lohmann, "anenduring shift of power in favour ofthe peasants" is also needed forsuch reforms to endure (Colchester&Lohmann).
  36. 36. Agriculture - Cash Crops andCattle RanchingUndisturbed and logged rainforest areas are being totallycleared to provide land for food crops, tree plantations orfor grazing cattle (Colchester & Lohmann). Much of thisproduce is exported to rich industrialised countries and inmany cases, crops are grown for export while the localpopulace goes hungry.Due to the delicate nature of rainforest soil and thedestructive nature of present day agricultural practices,the productivity of cash crops grown on rainforest soilsdeclines rapidly after a few years.Monoculture plantations - those that produce only onespecies of tree or one type of food - on rainforest soil areexamples of non-sustainable agriculture.
  37. 37. Solutions:"Reducing the demand forSouthern-produced agribusiness crops andalleviating the pressure from externally-financed development projects and assistanceis the essential first step" (Colchester andLohmann).
  38. 38. Fuel woodThe United Nations Foodand AgricultureOrganisation estimates that1.5 billion of the 2 billionpeople worldwide who relyon fuel wood for cookingand heating are overcuttingforests. This problem isworst in drier regions of thetropics. Solutions willprobably involve a returnto local peoples control ofthe forests they depend on.
  39. 39.  The sheer weight of water in Large Dams dams has in Chile,The construction of dams not Zimbabwe, and Greece led toonly destroys the forest but earthquakes. The irrigationoften uproots tens of and industrial projectsthousands of people, powered by dams lead todestroying both their land further environmentaland their culture. The rates of damage. Irrigation leads towaterborne diseases increase salination of soils andrapidly. Downstream industry leads to pollution.ecosystems are damaged bydams which trap silt, holdingback valuable nutrients.Reduced silt leads to coastalerosion.
  40. 40. Solutions: Aid organisations like the World Bank have traditionally favoured spectacular large-scale irrigation and hydro-electric projects. In all cases when such projects are proposed, there has been massive opposition from local people. Reform of the World Bank and other such organisations, and support for campaigns against large-scale dams is needed.
  41. 41. Mining and Industry Mining and industrial development lead to direct forest loss due to the clearing of land to establish projects. Indigenous people are displaced. Roads are constructed through previously inaccessible land, opening up the rainforest. Severe water, air and land pollution occurs from mining and industry.
  42. 42. Solutions: Local campaigns against mining and industrial development, and the campaigns to reform the large aid agencies which fund such schemes, should be supported.
  43. 43. Tourism themselves as eco tourist establishments are inThe creation of national parks has fact exploiting theundoubtedly helped to protect environment for profit.rainforests. Yet, as national parksare open to the public, tourism isdamaging some of these areas.Ecotourism, or environmentallyfriendly tourism, should educatethe tourists to be environmentallyaware. It should also be of lowimpact to its environment.Unfortunately, many companiesand resorts who advertise
  44. 44. Solutions: The rights of indigenous forest dwellers and others who depend on intact forests must be upheld. In instances where there are campaigns opposing specific tourist developments, they should be supported. Genuine ecotourism should be preferred to other tourist enterprises.
  45. 45. REFERENCES:http://library.thinkquest.org/26026/Environmental_Problems/environmental_problems.htmlhttp://myecoproject.org/get-involved/pollution/acid-rain/http://www.rainforestinfo.org.au/background/causes.htmhttp://www.google.com.ph/#hl=tl&source=hp&q=RAINFOREST+TOURISM+IMAGE&oq=RAINFOREST+TOURISM+IMAGEhttp://www.google.com.ph/#hl=tl&source=hp&q=environment+images