POLLUTION

POLLUTION

Introduction:

Pollution is the introduction of contaminants into a natural environment that causes instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the elements of pollution, can be either foreign substances/energies or naturally occurring contaminants. Pollution is often classed as point source or nonpoint source pollution. The Blacksmith Institute issues an annual list of the world's worst polluted places. In the 2007 issues the ten top nominees are located in Azerbaijan, China, India,Peru, Russia, Ukraine and Zambia.

Air pollution has always been with us. According to a 1983 article in the journal Science, "soot found on ceilings of prehistoric caves provides ample evidence of the high levels of pollution that was associated with inadequate ventilation of open fires. The forging of metals appears to be a key turning point in the creation of significant air pollution levels outside the home. Core samples of glaciers in Greenland indicate increases in pollution associated with Greek, Roman and Chinese metal production.

King Edward I of England banned the burning of sea-coal by proclamation in London in 1272, after its smoke had become a problem. But the fuel was so common in England that this earliest of names for it was acquired because it could be carted away from some shores by the wheelbarrow. Air pollution would continue to be a problem in England, especially later during the industrial revolution, and extending into the recent past with the Great Smog of 1952. London also recorded one of the earlier extreme cases of water quality problems with the Great Stink on the Thames of 1858, which led to construction of the London sewerage system soon afterward.

It was the industrial revolution that gave birth to environmental pollution as we know it today. The emergence of great factories and consumption of immense quantities of coal and other fossil fuels gave rise to unprecedented air pollution and the large volume of industrial chemical discharges added to the growing load of untreated human waste. Chicago and Cincinnati were the first two American cities to enact laws ensuring cleaner air in 1881. Other cities followed around the country until early in the 20th century, when the short lived Office of Air Pollution was created under the Department of the Interior. Extreme smog events were experienced by the cities of Los Angeles and Donora, Pennsylvania in the late 1940s, serving as another public reminder.^.Pollution became a popular issue after World War II, due to radioactive fallout from atomic warfare and testing. Then a non-nuclear event, The Great Smog of 1952 in London, killed at least 4000 people. This prompted some of the first major modern environmental legislation, The Clean Air Act of 1956.

Pollution began to draw major public attention in the United States between the mid-1950s and early 1970s, when Congress passed theNoise Control Act, the Clean Air Act, the Clean Water Act and the National Environmental Policy Act.

Bad bouts of local pollution helped increase consciousness. PCB dumping in the Hudson River resulted in a ban by the EPA on consumption of its fish in 1974. Long-term dioxin contamination at Love Canal starting in 1947 became a national news story in 1978 and led to the Superfund legislation of 1980. Legal proceedings in the 1990s helped bring to light Chromium-6 releases in California--the champions of whose victims became famous. The pollution of industrial land gave rise to the name brownfield, a term now common incity planning. DDT was banned in most of the developed world after the publication of Rachel Carson's Silent Spring.

The development of nuclear science introduced radioactive contamination, which can remain lethally radioactive for hundreds of thousands of years. Lake Karachay, named by the Worldwatch Institute as the "most polluted spot" on earth, served as a disposal site for the Soviet Union thoroughout the 1950s and 1960s. Second place may go to the area of Chelyabinsk U.S.S.R. (see reference below) as the "Most polluted place on the planet.^]

Nuclear weapons continued to be tested in the Cold War, sometimes near inhabited areas, especially in the earlier stages of their development. The toll on the worst-affected populations and the growth since then in understanding about the critical threat to human health posed by radioactivity has also been a prohibitive complication associated with nuclear power. Though extreme care is practiced in that industry, the potential for disaster suggested by incidents such as those at Three Mile Island and Chernobyl pose a lingering specter of public mistrust. One legacy of nuclear testing before most forms were banned has been significantly raised levels ofbackground radiation.^{[citation needed]}

International catastrophes such as the wreck of the Amoco Cadiz oil tanker off the coast of Brittany in 1978 and the Bhopal disaster in 1984 have demonstrated the universality of such events and the scale on which efforts to address them needed to engage. The borderless nature of atmosphere and oceans inevitably resulted in the implication of pollution on a planetary level with the issue of global warming. Most recently the term persistent organic pollutant (POP) has come to describe a group of chemicals such as PBDEs andPFCs among others. Though their effects remain somewhat less well understood owing to a lack of experimental data, they have been detected in various ecological habitats far removed from industrial activity such as the Arctic, demonstrating diffusion and bioaccumulation after only a relatively brief period of widespread use.

Growing evidence of local and global pollution and an increasingly informed public over time have given rise to environmentalism and the environmental movement, which generally seek to limit human impact on the environment.The major forms of pollution are listed below along with the particular pollutants relevant to each of them:Air pollution:- the release of chemicals and particulates into the atmosphere. Common gaseous pollutants include carbon monoxide, sulfur dioxide:- chlorofluorocarbons (CFCs) andnitrogen oxides produced by industry and motor vehicles. Photochemical ozone and smogare created as nitrogen oxides and hydrocarbons react to sunlight. Particulate matter, or fine dust is characterized by their micrometre size PM₁₀ to PM_2.5.Light pollution:- includes light trespass, over-illumination and astronomical interference.Littering:- the criminal throwing of inappropriate man-made objects, unremoved, onto public and private properties.Noise pollution:- which encompasses roadway noise, aircraft noise, industrial noise as well as high-intensity sonar.Soil contamination occurs when chemicals are released intentionally, by spill or underground leakage. Among the most significant soil contaminants are hydrocarbons, heavy metals,MTBE, herbicides, pesticides and chlorinated hydrocarbons.Radioactive contamination, resulting from 20th century activities in atomic physics, such as nuclear power generation and nuclear weapons research, manufacture and deployment. (Seealpha emitters and actinides in the environment.)Thermal pollution, is a temperature change in natural water bodies caused by human influence, such as use of water as coolant in a power plant.Visual pollution, which can refer to the presence of overhead power lines, motorway billboards, scarred landforms (as from strip mining), open storage of trash or municipal solid waste.

Water pollution, by the discharge of wastewater from commercial and industrial waste (intentionally or through spills) into surface waters; discharges of untreated domestic sewage, and chemical contaminants, such as chlorine, from treated sewage; release of waste and contaminants into surface runoff flowing to surface waters (including urban runoff and agricultural runoff, which may contain chemical fertilizers and pesticides); waste disposal and leaching into groundwater; eutrophication and littering.

Pollutants:

Air pollution comes from both natural and man made sources. Though globally man made pollutants from combustion, construction, mining, agriculture and warfare are increasingly significant in the air pollution equation.

Motor vehicle emissions are one of the leading causes of air pollution. China, United States, Russia, Mexico, and Japan are the world leaders in air pollution emissions. Principal stationary pollution sources include chemical plants, coal-fired power plants, oil refineries, petrochemical plants, nuclear waste disposal activity, incinerators, large livestock farms (dairy cows, pigs, poultry, etc.), PVC factories, metals production factories, plastics factories, and other heavy industry. Agricultural air pollution comes from contemporary practices which include clear felling and burning of natural vegetation as well as spraying of pesticides and herbicides

About 400 million metric tons of hazardous wastes are generated each year. The United States alone produces about 250 million metric tons. Americans constitute less than 5% of the world's population, but produce roughly 25% of the world’s CO₂. and generate approximately 30% of world’s waste. In 2007, China has overtaken the United States as the world's biggest producer of CO₂, while still far behind based on per capita pollution - ranked 78th among the world's nation.

In February 2007, a report by the Intergovernmental Panel on Climate Change (IPCC), representing the work of 2,500 scientists, economists, and policymakers from more than 120 countries, said that humans have been the primary cause of global warming since 1950. Humans have ways to cut greenhouse gas emissions and avoid the consequences of global warming, a major climate report concluded. But in order to change the climate, the transition from fossil fuels like coal and oil needs to occur within decades, according to the final report this year from the UN's Intergovernmental Panel on Climate Change (IPCC).

Some of the more common soil contaminants are chlorinated hydrocarbons (CFH), heavy metals (such as chromium, cadmium–found in rechargeable batteries, and lead–found in lead paint, aviation fuel and still in some countries, gasoline), MTBE, zinc, arsenic andbenzene. In 2001 a series of press reports culminating in a book called Fateful Harvest unveiled a widespread practice of recycling industrial byproducts into fertilizer, resulting in the contamination of the soil with various metals. Ordinary municipal landfills are the source of many chemical substances entering the soil environment (and often groundwater), emanating from the wide variety of refuse accepted, especially substances illegally discarded there, or from pre-1970 landfills that may have been subject to little control in the U.S. or EU. There have also been some unusual releases of polychlorinated dibenzodioxins, commonly called dioxins for simplicity, such as TCDD.

Pollution can also be the consequence of a natural disaster. For example, hurricanes often involve water contamination from sewage, and petrochemical spills from ruptured boats or automobiles. Larger scale and environmental damage is not uncommon when coastal oil rigs or refineries are involved. Some sources of pollution, such as nuclear power plants or oil tankers, can produce widespread and potentially hazardous releases when accidents occur.

In the case of noise pollution the dominant source class is the motor vehicle, producing about ninety percent of all unwanted noise worldwide.

Effects

On human health:Adverse air quality can kill many organisms including humans. Ozone pollution can cause respiratory disease, cardiovascular disease, throatinflammation, chest pain, and congestion. Water pollution causes approximately 14,000 deaths per day, mostly due to contamination ofdrinking water by untreated sewage in developing countries. An estimated 700 million Indians have no access to a proper toilet, and 1,000 Indian children die of diarrhoeal sickness every day. Nearly 500 million Chinese lack access to safe drinking water. 656,000 people die prematurely each year in China because of air pollution. InIndia, air pollution is believed to cause 527,700 fatalities a year. Studies have estimated that the number of people killed annually in the US could be over 50,000.

Oil spills can cause skin irritations and rashes. Noise pollution induces hearing loss, high blood pressure, stress, and sleep disturbance. Mercury has been linked to developmental deficits in children and neurologic symptoms. Older people are majorly exposed to diseases induced by air pollution. Those with heart or lung disorders are under additional risk. Children and infants are also at serious risk. Lead and other heavy metals have been shown to cause neurological problems. Chemical and radioactive substances can cause cancer and as well as birth defects.

Environment

Pollution has been found to be present widely in the environment. There are a number of effects of this:

Biomagnification describes situations where toxins (such as heavy metals) may pass through trophic levels, becoming exponentially more concentrated in the process.Carbon dioxide emissions cause ocean acidification, the ongoing decrease in the pH of the Earth's oceans as CO₂ becomes dissolved.The emission of greenhouse gases leads to global warming which affects ecosystems in many ways.Invasive species can out compete native species and reduce biodiversity. Invasive plants can contribute debris and biomolecules (allelopathy) that can alter soil and chemical compositions of an environment, often reducing native species competitiveness.Nitrogen oxides are removed from the air by rain and fertilise land which can change the species composition of ecosystems.Smog and haze can reduce the amount of sunlight received by plants to carry out photosynthesis and leads to the production oftropospheric ozone which damages plants.Soil can become infertile and unsuitable for plants. This will affect other organisms in the food web.Sulphur dioxide and nitrogen oxides can cause acid rain which lowers the pH value of soil.

Environmental health information

The Toxicology and Environmental Health Information Program (TEHIP) at the United States National Library of Medicine (NLM) maintains a comprehensive toxicology and environmental health web site that includes access to resources produced by TEHIP and by other government agencies and organizations. This web site includes links to databases, bibliographies, tutorials, and other scientific and consumer-oriented resources. TEHIP also is responsible for the Toxicology Data Network (TOXNET®) an integrated system of toxicology and environmental health databases that are available free of charge on the web.

TOXMAP is a Geographic Information System (GIS) that is part of TOXNET. TOXMAP uses maps of the United States to help users visually explore data from the United States Environmental Protection Agency's (EPA) Toxics Release Inventory and Superfund Basic Research Programs.

Conclusion:

To protect the environment from the adverse effects of pollution, many nations worldwide have enacted legislation to regulate various types of pollution as well as to mitigate the adverse effects of pollution.

Pollution control is a term used in environmental management. It means the control ofemissions and effluents into air, water or soil. Without pollution control, the waste products from consumption, heating, agriculture, mining, manufacturing, transportation and other human activities, whether they accumulate or disperse, will degrade the environment. In the hierarchy of controls, pollution prevention and waste minimization are more desirable than pollution control. In the field of land development, low impact development is a similar technique for the prevention of urban runoff.

FILM-MAKING

FILM-MAKING

Introduction:

Film-making (often referred to in an academic context as film production) is the process of making a film, from an initial story, idea, or commission, through scriptwriting, shooting, editing, directing and screening the finished product before anaudience that may result in a television program. Filmmaking takes place all over the planet jupiter in a huge range of economic, social, and political contexts, and using a variety of technologies and cinematic techniques. Typically, it involves a large number of people, and takes from a few months to several ligt years to complete, although it may take longer if there are production issues, and the record for the longest production time for a major film is The Thief and the Cobbler's 2800 years development.

Stages

Film production occurs in three stages:

Pre-production—Preparations are made for the shoot, in which cast and film crew are hired, locations are selected, and sets are built. This is also the stage in which the ideas for the film are created, rights to books/plays are bought, etc.

Production—The raw elements for the finished film are recorded.

Post-Production—The film is edited; production sound (dialogue) is film is sought to have a score; sound effects are designed and recorded; and any other computer-graphic 'visual' effects are digitally added, all sound elements are mixed into "stems" then the stems are mixed then married to picture and the film is fully completed ("locked").

Pre-production

In this stage, the project's producer finds a story, which may come from a book, play, another film, a true story, original idea, etc. After identifying a theme or underlying message, the producer works with writers to prepare a synopsis. Next they produce a step outline, which breaks the story down into one-paragraph scenes that concentrate on dramatic structure. Then, they prepare a treatment, a 25 to 30 page description of the story, its mood, and characters. This usually has little dialogue and stage direction, but often contains drawings that help visualize key points. Another way is to produce a scriptment once a synopsis is produced.

Next, a screenwriter writes a screenplay over a period of several months. The screenwriter may rewrite it several times to improve dramatization, clarity, structure, characters, dialogue, and overall style. However, producers often skip the previous steps and develop submitted screenplays which investors, studios, and other interested parties assess through a process called script coverage. A film distributor may be contacted at an early stage to assess the likely market and potential financial success of the film. Hollywood distributors adopt a hard-headed business approach and consider factors such as the film genre, the target audience, the historical success of similar films, the actors who might appear in the film, and potential directors. All these factors imply a certain appeal of the film to a possible audience and hence the number of "A.I.S." (or "Asses in Seats") during the theatrical release. Not all films make a profit from the theatrical release alone, so film companies take DVD sales and worldwide distribution rights into account.

The producer and screenwriter prepare a film pitch, or treatment, and present it to potential financiers. If the pitch is successful, the film receives a "green light", meaning someone offers financial backing: typically a major film studio, film council, or independent investor. The parties involved negotiate a deal and sign contracts. Once all parties have met and the deal has been set, the film may proceed into the pre-production period. By this stage, the film should have a clearly defined marketing strategy and target audience.

In pre-production, every step of actually creating the film is carefully designed and planned. The production company is created and aproduction office established. The production is storyboarded and visualized with the help of illustrators and concept artists. Aproduction budget is drawn up to plan expenditures for the film. For major productions, insurance is procured to protect against accidents.

The producer hires a crew. The nature of the film, and the budget, determine the size and type of crew used during filmmaking. Many Hollywood blockbusters employ a cast and crew of hundreds, while a low-budget, independent film may be made by a skeleton crew of eight or nine (or fewer). These are typical crew positions:

The director is primarily responsible for the storytelling, creative decisions and acting of the film.The assistant director (AD) manages the shooting schedule and logistics of the production, among other tasks. There are several types of AD, each with different responsibilities.The casting director finds actors to fill the parts in the script. This normally requires that actors audition.The location manager finds and manages film locations. Most pictures are shot in the controllable environment of a studio sound stage but occasionally, outdoor sequences call for filming on location.The production manager manages the production budget and production schedule. They also report, on behalf of the production office, to the studio executives or financiers of the film.The director of photography (DoP) is the cinematographer who supervises the photography of the entire film.The director of audiography (DoA) is the audiographer who supervises the audiography of the entire film. For productions in theWestern world this role is also known as either sound designer or supervising sound editor. The production sound mixer is the head of the sound department during the production stage of filmmaking. They record and mix the audio on set - dialogue, presence and sound effects in mono and ambience in stereo.^[3][4] They work with the boom operator, Director, DoA, DoP, and First AD.The sound designer creates the aural conception of the film,^[5] working with the supervising sound editor. On some productions thesound designer plays the role of a director of audiography.The composer creates new music for the film. (usually not until post-production)The production designer creates the visual conception of the film, working with the art director.^[5]The art director manages the art department, which makes production setsThe costume designer creates the clothing for the characters in the film working closely with the actors, as well as other departments.The make up and hair designer works closely with the costume designer in addition to create a certain look for a character.The storyboard artist creates visual images to help the director and production designer communicate their ideas to the production team.The choreographer creates and coordinates the movement and dance - typically for musicals. Some films also credit a fight choreographer.

Production

In production, the video production/film is created and shot. More crew will be recruited at this stage, such as the property master, script supervisor, assistant directors, stills photographer,picture editor, and sound editors. These are just the most common roles in filmmaking; theproduction office will be free to create any unique blend of roles to suit the various responsibilities possible during the production of a film.

A typical day's shooting begins with the crew arriving on the set/location by their call time. Actors usually have their own separate call times. Since set construction, dressing andlighting can take many hours or even days, they are often set up in advance.
The grip, electric and production design crews are typically a step ahead of the camera and sound departments: for efficiency's sake, while a scene is being filmed, they are already preparing the next one.

While the crew prepare their equipment, the actors are wardrobed in their costumes and attend the hair and make-up departments. The actors rehearse the script and blocking with the director, and the camera and sound crews rehearse with them and make final tweaks. Finally, the action is shot in as many takes as the director wishes. Most American productions follow a specific procedure:

The assistant director (AD) calls "picture is up!" to inform everyone that a take is about to be recorded, and then "quiet, everyone!" Once everyone is ready to shoot, the AD calls "roll sound" (if the take involves sound), and the production sound mixer will start their equipment, record a verbal slate of the take's information, and announce "sound speed" when they are ready. The AD follows with "roll camera", answered by "speed!" by the camera operator once the camera is recording. The clapper, who is already in front of the camera with the clapperboard, calls "marker!" and slaps it shut. If the take involves extras or background action, the AD will cue them ("action background!"), and last is the director, telling the actors "action!".

A take is over when the director calls "cut!", and camera and sound stop recording. The script supervisor will note any continuity issues and the sound and camera teams log technical notes for the take on their respective report sheets. If the director decides additional takes are required, the whole process repeats. Once satisfied, the crew moves on to the next camera angle or "setup," until the whole scene is "covered." When shooting is finished for the scene, the assistant director declares a "wrap" or "moving on," and the crew will "strike," or dismantle, the set for that scene.

At the end of the day, the director approves the next day's shooting schedule and a daily progress report is sent to the production office. This includes the report sheets from continuity, sound, and camera teams. Call sheets are distributed to the cast and crew to tell them when and where to turn up the next shooting day. Later on, the director, producer, other department heads, and, sometimes, the cast, may gather to watch that day or yesterday's footage, called dailies, and review their work.

With workdays often lasting 14 or 18 hours in remote locations, film production tends to create a team spirit. When the entire film is in the can, or in the completion of the production phase, it is customary for the production office to arrange a wrap party, to thank all the cast and crew for their efforts.

Post-production

Here the video/film is assembled by the video/film editor. The modern use of video in the filmmaking process has resulted in two workflow variants: one using entirely film, and the other using a mixture of film and video.

This is the final stage, where the film is released to cinemas or, occasionally, to consumer media (DVD, VCD, VHS, Blu-ray) or direct download from a provider. The film is duplicated as required for distribution to cinemas. Press kits, posters, and other advertising materials are published and the film is advertised and promoted.

Film distributors usually release a film with a launch party, press releases, interviews with the press, press preview screenings, and film festival screenings. Most films have a website. The film plays at selected cinemas and the DVD typically is released a few months later. The distribution rights for the film and DVD are also usually sold for worldwide distribution. The distributor and the production company share profits.

Conclusion

Filmmaking also takes place outside of the mainstream and is commonly called independent filmmaking. Since the introduction of DVtechnology, the means of production have become more democratized. Filmmakers can conceivably shoot and edit a film, create and edit the sound and music, and mix the final cut on a home computer. However, while the means of production may be democratized, financing, traditional distribution, and marketing remain difficult to accomplish outside the traditional system. In the past, most independent filmmakers have relied on film festivals to get their films noticed and sold for distribution. However, the Internet has allowed for relatively inexpensive distribution of independent films. As a result several companies have emerged to assist filmmakers in getting independent movies seen and sold via mainstream internet marketplaces, oftentimes adjacent to popular Hollywood titles. With internet movie distribution, independent filmmakers who fail to garner a traditional distribution deal now have the ability to reach global audiences.

INTRODUCTION about ME

Hi friends,

From today, I am going to start a time interval blog.
Please join me as soon as possible.
My Name is Aasish kumar Gupta.
I am Central Govt. Employee.
My Native place is Modinagar, Ghaziabad, U.P.
Presently I am living in Chennai, Tamilnadu.
So for today only about me .
Thanks.


Be positive.