Pollution

Pollution
Introduction
Pollution is when water, air or land becomes very dirty. Pollution can come in 4 different types effecting different types of areas in the world.
Air pollution affects the air, water pollution affects the water and marine life, land pollution effects the land destroying life and the environment and there is also noise pollution that can effect our hearing.
We all contribute to pollution in some way or another. Whether it be with a large amount or small amount we can still cause major damage to our health and the environment. Although we all contribute to help stop the increase of pollution. Very little people realize that pollution is very harmful because they don't think of the environment, themselves and other people and what it can do.
Pollution is an important factor to our lives. It involves our society and all other animals. Pollution is gradually destroying our planet and is gradually killing ourselves too. Like air pollution, smog and acid rain is a killer to all of us. It destroys marine life, our own health and destroys historical monuments and statues.

Air Pollution
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. Air pollution can be found both outdoors and indoors. Pollutants can be trapped inside buildings, causing indoor pollution that lasts for a long time. The sources of air pollution are both natural and human-based. As one might expect, humans have been producing increasing amounts of pollution as time has progressed, and they now account for the majority of pollutants released into the air. Air pollution has been a problem throughout history. Even in Rome people complained about smoke put into the atmosphere.
Definition
Air pollution occurs when the air contains gases, dust, fumes or odour in harmful amounts. That is, amounts which could be harmful to the health or comfort of humans and animals or which could cause damage to plants and materials. The substances that cause air pollution are called pollutants. Pollutants that are pumped into our atmosphere and directly pollute the air are called primary pollutants. Primary pollutant examples include carbon monoxide from car exhausts and sulfur dioxide from the combustion of coal. Further pollution can arise if primary pollutants in the atmosphere undergo chemical reactions. The resulting compounds are called secondary pollutants. Photochemical smog is an example of this.Causes There are many different chemical substances that contribute to air pollution. These chemicals come from a variety of sources. Among the many types of air pollutants are nitrogen oxides, carbon monoxides, and organic compounds that can evaporate and enter the atmosphere. Air pollutants have sources that are both natural and human. Now, humans contribute substantially more to the air pollution problem. Forest fires, volcanic eruptions, wind erosion, pollen dispersal, evaporation of organic compounds, and natural radioactivity are all among the natural causes of air pollution. Usually, natural air pollution does not occur in abundance in particular locations. The pollution is spread around throughout the world, and as a result, poses little threat to the health of people and ecosystems.Though some pollution comes from these natural sources, most pollution is the result of human activity. The biggest causes are the operation of fossil fuel-burning power plants and automobiles that combust fuel. Combined, these two sources are responsible for about 90% of all air pollution in the United States. Some cities suffer severely because of heavy industrial use of chemicals that cause air pollution. Places like Mexico City and Sao Paulo have some of the most deadly pollution levels in the world.Effects Air pollution is responsible for major health effects. Every year, the health of countless people is ruined or endangered by air pollution. Many different chemicals in the air affect the human body in negative ways. Just how sick people will get depends on what chemicals they are exposed to, in what concentrations, and for how long. Studies have estimated that the number of people killed annually in the US alone could be over 50,000. Older people are highly vulnerable to diseases induced by air pollution. Those with heart or lung disorders are under additional risk. Children and infants are also at serious risk. Because people are exposed to so many potentially dangerous pollutants, it is often hard to know exactly which pollutants are responsible for causing sickness. Also, because a mixture of different pollutants can intensify sickness, it is often difficult to isolate those pollutants that are at fault. Many diseases could be caused by air pollution without their becoming apparent for a long time. Diseases such as bronchitis, lung cancer, and heart disease may all eventually appear in people exposed to air pollution. Air pollutants such as ozone, nitrogen oxides, and sulfur dioxide also have harmful effects on natural ecosystems. They can kill plants and trees by destroying their leaves, and can kill animals, especially fish in highly polluted rivers.TreatingAir pollution has many disastrous effects that need to be curbed. In order to accomplish this, governments, scientists and environmentalists are 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 at least limiting the effects the process will produce. Five major input control methods exist. People may try to restrict population growth, use less energy, improve energy efficiency, reduce waste, and move to non-polluting renewable forms of energy production. Also, automobile-produced pollution can be decreased with highly beneficial results. Output control, the opposite method, seeks to fix the problems caused by air pollution. This usually means cleaning up an area that has been damaged by pollution. Input controls are usually more effective than output controls. Output controls are also more expensive, making them less desirable to tax payers and polluting industries.Current air pollution control efforts are not all highly effective. In wealthier countries, industries are often able to shift to methods that decrease air pollution. In the United States, for example, air pollution control laws have been successful in stopping air pollution levels from rising. However, in developing countries and even in countries where pollution is strictly regulated, much more needs to be done.Water PollutionWater pollution is the contamination of water bodies (e.g. lakes, rivers, oceans and groundwater). Water pollution occurs when pollutants are discharged directly or indirectly into water bodies without adequate treatment to remove harmful compounds. Water pollution affects plants and organisms living in these bodies of water; and, in almost all cases the effect is damaging not only to individual species and populations, but also to the natural biological communities.Interactions between groundwater and surface water are complex. Consequently, groundwater pollution, sometimes referred to as groundwater contamination, is not as easily classified as surface water pollution. By its very nature, groundwater aquifers are susceptible to contamination from sources that may not directly affect surface water bodies, and the distinction of point vs. non-point source may be irrelevant. A spill or ongoing releases of chemical or radionuclide contaminants into soil (located away from a surface water body) may not create point source or non-point source pollution, but can contaminate the aquifer below, defined as a toxin plume. The movement of the plume, called a plume front, may be analyzed through a hydrological transport model or groundwater model. Analysis of groundwater contamination may focus on the soil characteristics and site geology, hydrogeology, hydrology, and the nature of the contaminants.The specific contaminants leading to pollution in water include a wide spectrum of chemicals, pathogens, and physical or sensory changes such as elevated temperature and discoloration. While many of the chemicals and substances that are regulated may be naturally occurring (calcium, sodium, iron, manganese, etc.) the concentration is often the key in determining what is a natural component of water, and what is a contaminant. High concentrations of naturally-occurring substances can have negative impacts on aquatic flora and fauna.Ground Water Pollution:Interactions between groundwater and surface water are complex. Consequently, groundwater pollution, sometimes referred to as groundwater contamination, is not as easily classified as surface water pollution. By its very nature, groundwater aquifers are susceptible to contamination from sources that may not directly affect surface water bodies, and the distinction of point vs. non-point source may be irrelevant. A spill or ongoing releases of chemical or radionuclide contaminants into soil (located away from a surface water body) may not create point source or non-point source pollution, but can contaminate the aquifer below, defined as a toxin plume. The movement of the plume, called a plume front, may be analyzed through a hydrological transport model or groundwater model. Analysis of groundwater contamination may focus on the soil characteristics and site geology, hydrogeology, hydrology, and the nature of the contaminants.Causes:The specific contaminants leading to pollution in water include a wide spectrum of chemicals, pathogens, and physical or sensory changes such as elevated temperature and discoloration. While many of the chemicals and substances that are regulated may be naturally occurring (calcium, sodium, iron, manganese, etc.) the concentration is often the key in determining what is a natural component of water, and what is a contaminant. High concentrations of naturally-occurring substances can have negative impacts on aquatic flora and fauna.Oxygen-depleting substances may be natural materials, such as plant matter (e.g. leaves and grass) as well as man-made chemicals. Other natural and anthropogenic substances may cause turbidity (cloudiness) which blocks light and disrupts plant growth, and clogs the gills of some fish species.Many of the chemical substances are toxic. Pathogens can produce waterborne diseases in either human or animal hosts. Alteration of water's physical chemistry includes acidity (change in pH), electrical conductivity, temperature, and eutrophication. Eutrophication is an increase in the concentration of chemical nutrients in an ecosystem to an extent that increases in the primary productivity of the ecosystem. Depending on the degree of eutrophication, subsequent negative environmental effects such as anoxia (oxygen depletion) and severe reductions in water quality may occur, affecting fish and other animal populations.Chemical Water Pollution:Most water pollutants are eventually carried by rivers into the oceans. In some areas of the world the influence can be traced hundred miles from the mouth by studies using hydrology transport models. Advanced computer models such as SWMM or the DSSAM Model have been used in many locations worldwide to examine the fate of pollutants in aquatic systems. Indicator filter feeding species such as copepods have also been used to study pollutant fates in the New York Bight, for example. The highest toxin loads are not directly at the mouth of the Hudson River, but 100 kilometers south, since several days are required for incorporation into planktonic tissue. The Hudson discharge flows south along the coast due to coriolis force. Further south then are areas of oxygen depletion, caused by chemicals using up oxygen and by algae blooms, caused by excess nutrients from algal cell death and decomposition. Fish and shellfish kills have been reported, because toxins climb the food chain after small fish consume copepods, then large fish eat smaller fish, etc. Each successive step up the food chain causes a stepwise concentration of pollutants such as heavy metals (e.g. mercury) and persistent organic pollutants such as DDT. This is known as biomagnification, which is occasionally used interchangeably with bioaccumulation.Large gyres (vortexes) in the oceans trap floating plastic debris. The North Pacific Gyre for example has collected the so-called "Great Pacific Garbage Patch" that is now estimated at 100 times the size of Texas. Many of these long-lasting pieces wind up in the stomachs of marine birds and animals. This results in obstruction of digestive pathways which leads to reduced appetite or even starvation.Many chemicals undergo reactive decay or chemically change especially over long periods of time in groundwater reservoirs. A noteworthy class of such chemicals is the chlorinated hydrocarbons such as trichloroethylene (used in industrial metal degreasing and electronics manufacturing) and tetrachloroethylene used in the dry cleaning industry (note latest advances in liquid carbon dioxide in dry cleaning that avoids all use of chemicals). Both of these chemicals, which are carcinogens themselves, undergo partial decomposition reactions, leading to new hazardous chemicals (including dichloroethylene and vinyl chloride).Land Pollution Land pollution is one of the gravest kinds of pollutions. I say so because we do not realize when and how we pollute land due to different things we do and decisions we take. We realize the air is getting polluted when we step out of our houses and take a deep breath. We know when our actions cause water pollution, for we can see for ourselves the quality of the water worsening. Similarly noise, light, visual pollution can all be monitored, because we can all see or sense these kinds of pollution. However, land pollution is a hard one to get since we do not understand and we cannot comprehend which of our actions cause destruction of land. What is Land Pollution?When the anthropogenic effects of development adversely affect land (especially in turns of quality of land), it can be termed as land pollution. This brings us to an important question - what counts as an adverse effect? The answer is simple - anything that reduces the productivity and potential of a piece of land. Here, 'productivity and potential' refers to prospective uses of a piece of land for any of the different purposes for which land is used; including infrastructure, housing, services, agriculture, forestry, etc. If any of the effects of human development reduce the potential of a piece of land to be used for any good purpose, it amounts to land pollution.Causes of Land Pollution1. Degenerative Actions encompass a lot of human actions, including - deforestation, overuse of pesticides and chemical fertilizers, desertification, mining, inefficient and / or inadequate waste treatment, landfill, litter, etc. Many of these are unavoidable; however, definitely the severity of these actions in terms of the effects they have on the land can be reduced by taking appropriate and adequate corrective measure. For example, the amount of litter produced can be hugely reduced if we all strictly say NO to plastic. The key here is to conduct a thorough EIA - Environmental Impact Assessment.2. Misuse of Land mainly refers to felling of trees to clear land for agriculture, as well as processes like desertification and land conversion. Desertification is when anthropogenic effects of human development and / or other actions converts a piece of (essentially) fertile land into desert-land or dry land. Isn't that a scary thought? Land once converted to desert-land can never be reclaimed by any amount of corrective measures. This is also a serious issue because t does not only affect the land, but also the overall biodiversity of a place, specially when land is cleared for agriculture. A lot of indigenous flora and fauna is lost in the process.3. Inefficient Use of Land - surprised? Does inefficient use of land count as a cause of land pollution? Yes. Why? Due to the consequences of inefficient use of land. Inefficient use of land as such is not going to cause land pollution. However, inefficient use of land amounts to wastage, and hence shortage of land; and it is precisely during such conditions that man has to resort to measure such as deforestation and others to meet his needs. It is an important, albeit an indirect cause of land pollution that is often largely neglected. 4. Soil Pollution is when the top-most 'soil' layer of land is destroyed or polluted. Soil pollution is again another cause of land pollution that affects not only the land, but also a lot of other things such as forest cover of a region, productivity of land in terms of agriculture, grazing etc. Soil pollution is also caused by wrong agricultural practices, such as overuse of chemical fertilizers and pesticides. This causes non-biodegradable chemicals to enter and accumulate in the food-chain - a process often referred to as biomagnification of a pollutant. Effects of Land Pollution1. Effects on ClimateLand pollution can affect the general environment of the Earth. Land pollutions leads to loss in the forest cover of Earth. This is in turn going to affect the amount of rain. Less rains mean lesser vegetation. The effect of all different kinds of pollution will eventually lead to problems like acid rains, greenhouse effect, global warming. All of these problems have already initiated and need to be curbed before the situation runs out of control.2. Extinction of Species One of the major causes of concern is the extinction of species. Species are pushed towards endangerment and extinction primarily by two processes. Habitat fragmentation is the fragmentation of the natural habitat of an organism; cause primarily by urban sprawl. Habitat destruction, on the other hand, is when land clearing adversely affects animals special such that their natural habitat is lost. Both the actions can cause some species to go extinct and others to become invasive.3. BiomagnificationsBiomagnifications is the process in which certain non-biodegradable substances go on accumulating in the food-chain (in one or more species). The most common example is of methyl mercury in fish and mercury in eagles. Not only does biomagnification put the particular species at risk, it puts all the species above and below it at risk, and ultimately affects the food pyramid.PreventionDisposal of WastesProper waste management is the most important thing to do for the prevention of land pollution. Several steps should be taken to ensure that the waste gets disposed in the most harmless way, i.e. produces less or no toxins. One of the ways of doing this is by separating dry and wet waste. Dry waste should be recycled or it can be burned. On the other hand, wet waste should be decomposed. This decomposed waste should be further dumped in pits so that it can be converted into compost and used for agriculture. When disposing of waste, the authorities should treat it with various kinds of chemicals, so that it has a very low level of toxicity.Recycling and ReusePeople should buy and use products that have been recycled. For instance, plastic bags should be given up, instead, jute bags should be used. Reusing old items is another good way to reduce the stress on various resources. Clothes, paper, glass, everything should be recycled and reused, as far as possible.Biodegradable ProductsPeople should buy biodegradable products. Go organic - that's the mantra for avoiding land pollution. Organic farming, lessening the use of pesticides, buying organic fruits and vegetables and other products, will keep land pollution in check. Grow More TreesInitiative should be taken to grow more trees. Researches show that trees can actually fertilize the soil. This means that by growing trees, soil will become fertile, agriculture will get boosted and land pollution will greatly reduce.ConclusionMuch is being done to control, monitor and rectify damage done by pollutants. The problems are diverse and some are only being recognised but it is important to keep a close control over pollutants so that we can maintain the environment in an acceptable condition for future generations. We need to take pollution issue seriously because ignorance is certainly not the proper way to go. The stakes are really high and world needs to wake up and start acting right now because environmental issues are constantly growing in both number and size.Resources:en.wikipedia.org/wiki/Pollutionwww.greenstudentu.com/encyclopedia/pollutionwww.water-pollution.org.uk/causes.html.www.lenntech.com/water-pollution-faq.htmen.wikipedia.org/wiki/Air pollution |

Name: Saeed Mubarak Al Rashidi
Class: 7 - C