the natural law of awareness
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The Natural Law of Awareness
What you are aware of you can act on; what you are unaware of acts on you. This is such a
profound realization as taught to me by one of my mentors. The simple truth of it is
refreshing once you grasp it and the light bulb goes on in your head.
Awareness is a principle that exists and operates in our lives whether we are aware that it
does or not. Understanding how it works is crucial to success in your personal growth and
development. My experience is that the more keen your awareness in a situation or about a
particular circumstance, the more effective your actions and the results you achieve.
Let’s first define awareness…
Awareness speaks to your level of consciousness; how awake you are in a particular
situation. It speaks volumes about your knowledge, responsiveness and alertness. It is aboutyour sensitivity to you, circumstances and those around you. It goes to your receptiveness of
the outside world and how you manage it on the inside.
To the degree that you are aware of the inner and outer world, the effectiveness of your
choices, thoughts and actions will reflect the same. How you behave will largely depend on
how aware you are.
When you raise your level of awareness, you automatically raise your potential for success.
This is how the principle – the natural law of awareness works. It exists and operates
whether you know it or not or believe it or not. It simply is.
In my experience, awareness comes in 4 forms. You may have seen them categorizeddifferently; however, these are basically the 4 different forms of awareness.
1. Unawareness
The fact that you have no clue what is going on does not negate the fact that there is a level
of awareness in play. In a state of ignorance, everything and everyone is acting on you
without your knowledge. You may blame and complain about your circumstance and others
at this level; however, the truth is that your unawareness is the real culprit in your
frustration.
When you lack knowledge of something; you also lack the ability to make other choices
simply because you don’t even know they exist. In this case, ignorance is not necessarily
bliss – in fact, it could be down right miserable.
Here’s the lesson…
Whether you have knowledge or not doesn’t mean that the knowledge doesn’t exist and that
its existence isn’t operating in your life. It may be a little weird or hard to grasp at first BUT
think about it – really think about it.
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2. Reactive Awareness
In this case you are always aware of and act on circumstances and people around you. The
focus of your choices, thoughts and actions are largely based on how others view and treat
you.
Also, at this level, you do not accept total responsibility for your own choices, thoughts and
actions. Since you are mostly reacting to circumstances and other people, you blame them
for your choices, thoughts and actions. This is reactive behavior which causes a severe lack
of self-leadership.
Reactive awareness is not ideal simply because it leaves you out of the equation. When all
your choices, thoughts and actions are based on circumstances and/or other people, you
lack your own voice. You are not making decisions based on the things you value most but
rather on the things you believe others value most.
No matter what you believe at this moment, it is certain that this way of thinking will lead to
frustration and unhappiness. This is because, you cannot have good and firm grounding or a
good sense of direction when you are simply blowing the way others and circumstances
blow. If you change your stance with the direction of the wind, you will ultimately spiral into
chaos, confusion and disarray. Your level of personal growth and success will undoubtedly
be stunted.
3. Proactive Awareness
Proactive awareness is complete awareness. In this mindset, although you are aware of others and circumstances, you are most aware of yourself. You are completely in tune with
your choices, thoughts and actions and you understand that these are the things you truly
control.
You do not blame and complain about others and circumstances when things go wrong
because you realize that your choices, thoughts and actions precipitated that outcome.
Proactive awareness demands that you be responsible for you; the way you think and act in
any given situation.
This means that you are aware of your strengths and your shortcomings; you are aware of
others in the same manner; however, you do not base your choices on them. Your choicesare based on your core values regardless of what others think. The person you show others
is the person you want to be and not the person they want you to be.
This is the practice of complete awareness – proactive awareness. You take a deliberate
stance to be a person who evaluates his/her own choices, thoughts and actions so that you
can learn to improve yourself.
4. Instinctive Awareness
Frankly, this list could stop at 3; however, I have found it quite valuable to include this4th form of awareness. My experience is that when you practice something over and over
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again, you only become better and better at it. At some point, you no longer seem to have to
put much effort into succeeding at it because it has become a habit – a part of your DNA.
This form of awareness, I have dubbed instinctive awareness. At this level, you are so
keenly aware that things seem to happen and function automatically. You make choices,
think thoughts and act with your core values guiding you on auto-pilot. Certainly since youare always learning, there are things that will always be at the other 3 levels. Eventually
though, if you are diligent in your practice and seek to improve your awareness at all times,
you will end up here – at this level.
For instance, reading, writing and attending seminars and workshops by incredible
individuals from whom I can continue to learn is not something I really have to think about
anymore. I just do it; it seems automatic. I instinctively spend time, money and resources
improving my own personal power, growth and self-awareness. I love doing that and I realize
of course that it helps me tremendously to help others even better.
Pollution
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.[1] Pollution
can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the
components of pollution, can be either foreign substances/energies or naturally occurringcontaminants. 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 inAzerbaijan, China, India, Peru, Russia, Ukraine and Zambia.
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) and nitrogen
oxides produced by industry and motor vehicles. Photochemical ozone and smog are created as
nitrogen oxides andhydrocarbons react to sunlight. Particulate matter , or fine dust is
characterized by their micrometre size PM10 to PM2.5.
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 by spill or underground leakage. Among
the most significant soil contaminants are hydrocarbons,heavy metals, MTBE,[10] herbicides, pesticides and chlorinated hydrocarbons.
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Radioactive contamination, resulting from 20th century activities in atomic physics, such as
nuclear power generation and nuclear weapons research, manufacture and deployment.
(See alpha 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,municipal solid waste or space
debris.
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.
Air pollution is the introduction of chemicals, particulate matter , or biological materials that
cause harm or discomfort to humans or other living organisms, or cause damage to the natural
environment or built environment, into the atmosphere.
The atmosphere is a complex dynamic natural gaseous system that is essential to support life on
planet Earth.Stratospheric ozone depletion due to air pollution has long been recognized as a
threat to human health as well as to the Earth's ecosystems.
Indoor air pollution and urban air quality are listed as two of the world's worst pollution problems
in the 2008 Blacksmith Institute World's Worst Polluted Places report.
A substance in the air that can cause harm to humans and the environment is known as an air
pollutant. Pollutants can be in the form of solid particles, liquid droplets, or gases. In addition, they
may be natural or man-made.[2]
Pollutants can be classified as primary or secondary. Usually, primary pollutants are directly emitted
from a process, such as ash from a volcanic eruption, the carbon monoxide gas from a motor vehicle
exhaust or sulfur dioxide released from factories. Secondary pollutants are not emitted directly.
Rather, they form in the air when primary pollutants react or interact. An important example of a
secondary pollutant is ground level ozone — one of the many secondary pollutants that make up
photochemical smog. Some pollutants may be both primary and secondary: that is, they are both
emitted directly and formed from other primary pollutants.
Major primary pollutants produced by human activity include:
Sulphur oxides (SOx) - especially sulfur dioxide, a chemical compound with the formula SO2.SO2 is produced by volcanoes and in various industrial processes. Since coal and petroleum
often contain sulfur compounds, their combustion generates sulfur dioxide. Further oxidation of
SO2, usually in the presence of a catalyst such as NO2, forms H2SO4, and thus acid rain.[2] This is
one of the causes for concern over the environmental impact of the use of these fuels as power
sources.
Nitrogen oxides (NOx) - especially nitrogen dioxide are emitted from high temperature
combustion, and are also produced naturally duringthunderstorms by electrical discharge. Can be
seen as the brown haze dome above or plume downwind of cities. Nitrogen dioxide is the
chemical compound with the formula NO2. It is one of the several nitrogen oxides. This reddish-
brown toxic gas has a characteristic sharp, biting odor. NO2 is one of the most prominent air pollutants.
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Carbon monoxide (CO)- is a colourless, odorless, non-irritating but very poisonous gas. It is a
product by incomplete combustion of fuel such as natural gas, coal or wood. Vehicular exhaust is
a major source of carbon monoxide.
Carbon dioxide (CO2) - a colourless, odorless, non-toxic greenhouse gas also associated
with ocean acidification, emitted from sources such as combustion, cement production,
and respiration. It is otherwise recycled in the atmosphere in the carbon cycle.
Volatile organic compounds - VOCs are an important outdoor air pollutant. In this field they are
often divided into the separate categories of methane (CH4) and non-methane (NMVOCs).
Methane is an extremely efficient greenhouse gas which contributes to enhanced global warming.
Other hydrocarbon VOCs are also significant greenhouse gases via their role in creating ozone
and in prolonging the life of methane in the atmosphere, although the effect varies depending on
local air quality. Within the NMVOCs, the aromatic compounds benzene, toluene and xylene are
suspected carcinogens and may lead to leukemia through prolonged exposure. 1,3-butadiene is
another dangerous compound which is often associated with industrial uses.
Particulate matter - Particulates, alternatively referred to as particulate matter (PM) or fineparticles, are tiny particles of solid or liquid suspended in a gas. In contrast, aerosol refers to
particles and the gas together. Sources of particulate matter can be man made or natural. Some
particulates occur naturally, originating from volcanoes, dust storms, forest and grassland fires,
living vegetation, and sea spray. Human activities, such as the burning of fossil fuels in vehicles,
power plants and various industrial processes also generate significant amounts of aerosols.
Averaged over the globe, anthropogenic aerosols—those made by human activities—currently
account for about 10 percent of the total amount of aerosols in our atmosphere. Increased levels
of fine particles in the air are linked to health hazards such as heart disease,[3]altered lung
function and lung cancer.
Persistent free radicals connected to airborne fine particles could cause cardiopulmonarydisease.[4][5]
Toxic metals, such as lead, cadmium and copper .
Chlorofluorocarbons (CFCs) - harmful to the ozone layer emitted from products currently banned
from use.
Ammonia (NH3) - emitted from agricultural processes. Ammonia is a compound with the formula
NH3. It is normally encountered as a gas with a characteristic pungent odor. Ammonia contributes
significantly to the nutritional needs of terrestrial organisms by serving as a precursor to
foodstuffs and fertilizers. Ammonia, either directly or indirectly, is also a building block for the
synthesis of many pharmaceuticals. Although in wide use, ammonia is both caustic and
hazardous.
Odors — such as from garbage, sewage, and industrial processes
Radioactive pollutants - produced by nuclear explosions, nuclear events, war explosives, and
natural processes such as the radioactive decay of radon.
Secondary pollutants include:
Particulate matter formed from gaseous primary pollutants and compounds in photochemical
smog. Smog is a kind of air pollution; the word "smog" is a portmanteau of smoke and fog.
Classic smog results from large amounts of coal burning in an area caused by a mixture of smoke
and sulfur dioxide. Modern smog does not usually come from coal but from vehicular and
industrial emissions that are acted on in the atmosphere by ultraviolet light from the sun to form
secondary pollutants that also combine with the primary emissions to form photochemical smog.
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Ground level ozone (O3) formed from NOx and VOCs. Ozone (O3) is a key constituent of the
troposphere. It is also an important constituent of certain regions of the stratosphere commonly
known as the Ozone layer. Photochemical and chemical reactions involving it drive many of the
chemical processes that occur in the atmosphere by day and by night. At abnormally high
concentrations brought about by human activities (largely the combustion of fossil fuel), it is a
pollutant, and a constituent of smog.
Peroxyacetyl nitrate (PAN) - similarly formed from NOx and VOCs.
Minor air pollutants include:
A large number of minor hazardous air pollutants. Some of these are regulated in USA under
the Clean Air Act and in Europe under the Air Framework Directive.
A variety of persistent organic pollutants, which can attach to particulate matter.
Persistent organic pollutants (POPs) are organic compounds that are resistant to environmental
degradation through chemical, biological, and photolytic processes. Because of this, they have been
observed to persist in the environment, to be capable of long-range transport, bioaccumulate in
human and animal tissue, biomagnify in food chains, and to have potential significant impacts on
human health and the environment.
Sources of air pollution refer to the various locations, activities or factors which are responsible for the
releasing of pollutants into the atmosphere. These sources can be classified into two major categories
which are:
Anthropogenic sources (human activity) mostly related to burning different kinds of fuel
"Stationary Sources" include smoke stacks of power plants, manufacturing facilities (factories)
and waste incinerators, as well as furnaces and other types of fuel-burning heating devices. In
developing and poor countries, traditional biomass burning is the major source of air pollutants;
traditional biomass includes wood, crop waste and dung.[6][7]
"Mobile Sources" include motor vehicles, marine vessels, aircraft and the effect of sound etc.
Chemicals, dust and controlled burn practices in agriculture and forestry management. Controlled
or prescribed burning is a technique sometimes used in forest management, farming, prairie
restoration or greenhouse gas abatement. Fire is a natural part of both forest and grassland
ecology and controlled fire can be a tool for foresters. Controlled burning stimulates the
germination of some desirable forest trees, thus renewing the forest.
Fumes from paint, hair spray, varnish, aerosol sprays and other solvents
Waste deposition in landfills, which generate methane. Methane is not toxic; however, it is highly
flammable and may form explosive mixtures with air. Methane is also an asphyxiant and may
displace oxygen in an enclosed space. Asphyxia or suffocation may result if the oxygen
concentration is reduced to below 19.5% by displacement
Military, such as nuclear weapons, toxic gases, germ warfare and rocketry
Natural sources
Dust from natural sources, usually large areas of land with little or no vegetation
Methane, emitted by the digestion of food by animals, for example cattle
Radon gas from radioactive decay within the Earth's crust. Radon is a colorless, odorless,
naturally occurring, radioactive noble gas that is formed from the decay of radium. It is consideredto be a health hazard. Radon gas from natural sources can accumulate in buildings, especially in
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confined areas such as the basement and it is the second most frequent cause of lung cancer,
after cigarette smoking
Smoke and carbon monoxide from wildfires
Vegetation, in some regions, emits environmentally significant amounts of VOCs on warmer days.
These VOCs react with primary anthropogenic pollutants—specifically, NOx, SO2, andanthropogenic organic carbon compounds—to produce a seasonal haze of secondary pollutants.[8]
Volcanic activity, which produce sulfur , chlorine, and ash particulates
Reduction efforts
There are various air pollution control technologies and land use planning strategies available to
reduce air pollution. At its most basic level land use planning is likely to involve zoning and transport
infrastructure planning. In most developed countries, land use planning is an important part of social
policy, ensuring that land is used efficiently for the benefit of the wider economy and population as
well as to protect the environment.
Efforts to reduce pollution from mobile sources includes primary regulation (many developing
countries have permissive regulations),[citation needed ] expanding regulation to new sources (such
as cruiseand transport ships, farm equipment, and small gas-powered equipment such as lawn
trimmers, chainsaws, and snowmobiles), increased fuel efficiency (such as through the use of hybrid
vehicles), conversion to cleaner fuels (such as bioethanol, biodiesel, or conversion to electric
vehicles).
Control devices
The following items are commonly used as pollution control devices by industry or transportation
devices. They can either destroy contaminants or remove them from an exhaust stream before it is
emitted into the atmosphere.
Particulate control
Mechanical collectors (dust cyclones, multicyclones)
Electrostatic precipitators An electrostatic precipitator (ESP), or electrostatic air cleaner is a
particulate collection device that removes particles from a flowing gas (such as air) using the
force of an induced electrostatic charge. Electrostatic precipitators are highly efficient filtration
devices that minimally impede the flow of gases through the device, and can easily remove
fine particulate matter such as dust and smoke from the air stream.
Baghouses Designed to handle heavy dust loads, a dust collector consists of a blower, dust
filter, a filter-cleaning system, and a dust receptacle or dust removal system (distinguished
from air cleaners which utilize disposable filters to remove the dust).
Particulate scrubbersWet scrubber is a form of pollution control technology. The term
describes a variety of devices that use pollutants from a furnace flue gas or from other gas
streams. In a wet scrubber, the polluted gas stream is brought into contact with the scrubbing
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liquid, by spraying it with the liquid, by forcing it through a pool of liquid, or by some other
contact method, so as to remove the pollutants.
Water pollution is the contamination of water bodies
(e.g. lakes, rivers, oceans, aquifers 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 . In almost all cases the
effect is damaging not only to individual species and populations, but also to the natural biological
communities.
Introduction
Water pollution is a major global problem which requires ongoing evaluation and revision of water
resource policy at all levels (international down to individual aquifers and wells). It has beensuggested that it is the leading worldwide cause of deaths and diseases, [1][2] and that it accounts for
the deaths of more than 14,000 people daily.[2] An estimated 700 million Indians have no access to a
proper toilet, and 1,000 Indian children die of diarrheal sickness every day.[3]Some 90% of China's
cities suffer from some degree of water pollution,[4] and nearly 500 million people lack access to safe
drinking water.[5] In addition to the acute problems of water pollution in developing
countries, developed countries continue to struggle with pollution problems as well. In the most recent
national report on water quality in the United States, 45 percent of assessed stream miles, 47 percent
of assessed lake acres, and 32 percent of assessed bay andestuarine square miles were classified as
polluted.[6]
Water is typically referred to as polluted when it is impaired by anthropogenic contaminants and either does not support a human use, such as drinking water , and/or undergoes a marked shift in its ability
to support its constituent biotic communities, such as fish. Natural phenomena such
as volcanoes, algae blooms, storms, and earthquakes also cause major changes in water quality and
the ecological status of water.
Categories
Surface water and groundwater have often been studied and managed as separate resources,
although they are interrelated.[7] Surface water seeps through the soil and becomes groundwater.
Conversely, groundwater can also feed surface water sources. Sources of surface water pollution are
generally grouped into two categories based on their origin.Point sources
Point source water pollution refers to contaminants that enter a waterway from a single, identifiable
sourcesm, such as a pipe or ditch. Examples of sources in this category include discharges from
a sewage treatment plant, a factory, or a city storm drain. The U.S. Clean Water Act (CWA) defines
point source for regulatory enforcement purposes.[8] The CWA definition of point source was amended
in 1987 to include municipal storm sewer systems, as well as industrial stormwater, such as from
construction sites.[9]
Non–point sources
Non–point source pollution refers to diffuse contamination that does not originate from a singlediscrete source. NPS pollution is often the cumulative effect of small amounts of contaminants
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gathered from a large area. A common example is the leaching out of nitrogen compounds from
fertilized agricultural lands. Nutrient runoff in stormwater from "sheet flow" over an agricultural field or
a forest are also cited as examples of NPS pollution.
Contaminated storm water washed off of parking lots, roads and highways, called urban runoff , is
sometimes included under the category of NPS pollution. However, this runoff is typically channeledinto storm drain systems and discharged through pipes to local surface waters, and is a point source.
However where such water is not channeled and drains directly to ground it is a non-point source
Control of pollution
[edit]Domestic sewage
Main article: Sewage treatment
Domestic sewage is 99.9 percent pure water, while the other 0.1 percent are pollutants. Although
found in low concentrations, these pollutants pose risk on a large scale.[22] In urban areas, domestic
sewage is typically treated by centralized sewage treatment plants. In the U.S., most of these plants
are operated by local government agencies, frequently referred to as publicly owned treatment
works (POTW). Municipal treatment plants are designed to controlconventional pollutants: BOD and
suspended solids. Well-designed and operated systems (i.e., secondary treatment or better) can
remove 90 percent or more of these pollutants. Some plants have additional sub-systems to treat
nutrients and pathogens. Most municipal plants are not designed to treat toxic pollutants found in
industrial wastewater.[23]
Cities with sanitary sewer overflows or combined sewer overflows employ one or
more engineering approaches to reduce discharges of untreated sewage, including:
utilizing a green infrastructure approach to improve stormwater management capacity throughout
the system, and reduce the hydraulic overloading of the treatment plant[24]
repair and replacement of leaking and malfunctioning equipment[15]
increasing overall hydraulic capacity of the sewage collection system (often a very expensive
option).
A household or business not served by a municipal treatment plant may have an individual septic
tank, which treats the wastewater on site and discharges into the soil. Alternatively, domestic
wastewater may be sent to a nearby privately owned treatment system (e.g. in a rural community).
[edit]Industrial wastewater Main article: Industrial wastewater treatment
Some industrial facilities generate ordinary domestic sewage that can be treated by municipal
facilities. Industries that generate wastewater with high concentrations of conventional pollutants (e.g.
oil and grease), toxic pollutants (e.g. heavy metals, volatile organic compounds) or other
nonconventional pollutants such as ammonia, need specialized treatment systems. Some of these
facilities can install a pre-treatment system to remove the toxic components, and then send the
partially-treated wastewater to the municipal system. Industries generating large volumes of
wastewater typically operate their own complete on-site treatment systems.
Some industries have been successful at redesigning their manufacturing processes to reduce or eliminate pollutants, through a process called pollution prevention.
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Heated water generated by power plants or manufacturing plants may be controlled with:
cooling ponds, man-made bodies of water designed for cooling by evaporation, convection,
and radiation
cooling towers, which transfer waste heat to the atmosphere through evaporation and/or heat
transfer
cogeneration, a process where waste heat is recycled for domestic and/or industrial heating
purposes
Noise pollution is excessive, displeasing human, animal, or machine-created environmental
noise that disrupts the activity or balance of human or animal life. The word noise comes from
the Latin word nauseas, meaning seasickness.
The source of most outdoor noise worldwide is mainly construction and transportation systems,
including motor vehicle noise, aircraft noise, and rail noise.[1][2] Poor urban planning may give rise
to noise pollution, since side-by-side industrial and residential buildings can result in noise
pollution in the residential area.
Health effects
[edit]Human health
Noise health effects describe problems in both health and behavior. Unwanted sound (noise) can
damage physiological and psychological health. Noise pollution can cause annoyance and
aggression,hypertension, high stress levels, tinnitus, hearing loss, sleep disturbances, and other
harmful effects.[3][4][5][6] Furthermore, stress and hypertension are the leading causes to health
problems, whereas tinnitus can lead to forgetfulness, severe depression and at times panic attacks.[4]
[7]
Chronic exposure to noise may cause noise-induced hearing loss. Older males exposed to
significant occupational noise demonstrate significantly reduced hearing sensitivity than their non-
exposed peers, though differences in hearing sensitivity decrease with time and the two groups are
indistinguishable by age 79.[8] A comparison of Maaban tribesmen, who were insignificantly exposed
to transportation or industrial noise, to a typical U.S. population showed that chronic exposure to
moderately high levels of environmental noise contributes to hearing loss.[3]
High noise levels can contribute to cardiovascular effects and exposure to moderately high levels
during a single eight hour period causes a statistical rise in blood pressure of five to ten points and an
increase in stress[3] and vasoconstriction leading to the increased blood pressure noted above as well
as to increased incidence of coronary artery disease.
Noise pollution is also a cause of annoyance. A 2005 study by Spanish researchers found that in
urban areas households are willing to pay approximately four Euros per decibel per year for noise
reduction.[9]
[edit]Wildlife health
Noise can have a detrimental effect on animals, increasing the risk of death by changing the delicate
balance in predator or prey detection and avoidance, and interfering the use of the sounds in
communication especially in relation to reproduction and in navigation. Acoustic overexposure can
lead to temporary or permanent loss of hearing.[10]
An impact of noise on animal life is the reduction of usable habitat that noisy areas may cause, whichin the case of endangered species may be part of the path to extinction. Noise pollution has caused
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the death of certain species of whales that beached themselves after being exposed to the loud sound
of military sonar [11] (see also Marine mammals and sonar ).
Noise also makes species communicate louder, which is called Lombard vocal response.[12] Scientists
and researchers have conducted experiments that show whales' song length is longer when
submarine-detectors are on.
[13]
If creatures do not "speak" loud enough, their voice willbe masked by anthropogenic sounds. These unheard voices might be warnings, finding of prey, or
preparations of net-bubbling. When one species begins speaking louder, it will mask other species'
voice, causing the whole ecosystem to eventually speak louder.
European Robins living in urban environments are more likely to sing at night in places with high
levels of noise pollution during the day, suggesting that they sing at night because it is quieter, and
their message can propagate through the environment more clearly.[14] The same study showed that
daytime noise was a stronger predictor of nocturnal singing than night-time light pollution, to which the
phenomenon is often attributed.
Zebra finches become less faithful to their partners when exposed to traffic noise. This could alter a
population's evolutionary trajectory by selecting traits, sapping resources normally devoted to other activities and thus lead to profound genetic and evolutionary consequences
Mitigation and control of noise
Main article: Noise mitigation
Technology to mitigate or remove noise can be applied as follows:
There are a variety of strategies for mitigating roadway noise including: use of noise barriers,
limitation of vehicle speeds, alteration of roadway surface texture, limitation of heavy vehicles, use of
traffic controls that smooth vehicle flow to reduce braking and acceleration, and tire design. An
important factor in applying these strategies is a computer model for roadway noise, that is capable of addressing local topography, meteorology, traffic operations and hypothetical mitigation. Costs of
building-in mitigation can be modest, provided these solutions are sought in the planning stage of a
roadway project.
Aircraft noise can be reduced to some extent by design of quieter jet engines, which was pursued
vigorously in the 1970s and 1980s. This strategy has brought limited but noticeable reduction of urban
sound levels. Reconsideration of operations, such as altering flight paths and time of day runway use,
has demonstrated benefits for residential populations near airports. FAA sponsored residential retrofit
(insulation) programs initiated in the 1970s has also enjoyed success in reducing
interior residential noise in thousands of residences across the United States.
Exposure of workers to Industrial noise has been addressed since the 1930s. Changes include
redesign of industrial equipment, shock mounting assemblies and physical barriers in the workplace.
Firefighting is the act of extinguishing fires. A firefighter fights fires to prevent loss of life, and/or
destruction of property and the environment. Firefighting is a highly technical skill that requires
professionals who have spent years training in both general firefighting techniques and specialized
areas of expertise.
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Science of extinguishment
See also: Fire Chemistry and Physical properties of wildfires
Fire elements[3]
There are four elements needed to start and sustain a fire and/or flame. These elements are classified
in the “fire tetrahedron” and are:
1. Reducing agent (fuel)
2. Heat
3. Self-sustained chemical chain reaction
4. Oxidizing agent (oxygen)
The reducing agent, or fuel, is the substance or material that is being oxidized or burned in the
combustion process. The most common fuels contain carbon along with combinations of hydrogen
and oxygen. Heat is the energy component of the fire tetrahedron. When heat comes into contact with
a fuel, it provides the energy necessary for ignition, causes the continuous production and ignition of
fuel vapors or gases so that the combustion reaction can continue, and causes the vaporization of
solid and liquid fuels. The self-sustained chemical chain reaction is a complex reaction that requires a
fuel, an oxidizer, and heat energy to come together in a very specific way. A chain reaction is a series
of reactions that occur in sequence with the results of each individual reaction being added to the rest.
This happens in the science of fire, but is self-sustaining in that it continues without interruption. An
oxidizing agent is a material or substance that when the proper conditions exist will release gases,
including oxygen. This is crucial to the sustainment of a flame or fire.
A fire helicopter is used to fight a wildfire
A fire can be extinguished by taking away any of the four components of the tetrahedron.[3] One
method to extinguish a fire is to use water. The first way that water extinguishes a fire is by cooling,
which removes heat from the fire. This is possible through water’s ability to absorb massive amounts
of heat by converting water to water vapor . Without heat, the fuel cannot keep the oxidizer
from reducing the fuel to sustain the fire. The second way water extinguishes a fire is by smothering
the fire. When water is heated to its boiling point, it converts to water vapor. When this conversion
takes place, it dilutes the oxygen in the air with water vapor, thus removing one of the elements that
the fire requires to burn. This can also be done with foam.
Another way to extinguish a fire is fuel removal. This can be accomplished by stopping the flow of
liquid or gaseous fuel or by removing solid fuel in the path of a fire. Another way to accomplish this isto allow the fire to burn until all the fuel is consumed, at which point the fire will self-extinguish.
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One final extinguishing method is chemical flame inhibition. This can be accomplished through dry
chemical and halogenated agents. These agents interrupt the chemical chain reaction and stop
flaming. This method is effective on gas and liquid fuels because they must flame to burn.
Use of water
Often, the main way to extinguish a fire is to spray with water. The water has two roles:
in contact with the fire, it vaporizes, and this vapour displaces the oxygen (the volume of water
vapour is 1,700 times greater than liquid water, at 1,000°F (540°C) this expansion is over 4,000
times); leaving the fire with insufficient combustive agent to continue, and it dies out.[2]
the vaporization of water absorbs the heat; it cools the smoke, air, walls, objects in the room, etc.,
that could act as further fuel, and thus prevents one of the means that fires grow, which is by
"jumping" to nearby heat/fuel sources to start new fires, which then combine.
The extinguishment is thus a combination of "asphyxia" and cooling. The flame itself is suppressed by
asphyxia, but the cooling is the most important element to master a fire in a closed area.
Water may be accessed from a pressurized fire hydrant, pumped from water sources such as lakes or
rivers, delivered by tanker truck, or dropped from aircraft tankers in fighting forest fires.
[edit]Open air fire
For fires in the open, the seat of the fire is sprayed with a straight spray: the cooling effect
immediately follows the "asphyxia" by vapor [citation needed ], and reduces the amount of water required. A
straight spray is used so the water arrives massively to the seat without being vaporized before. A
strong spray may also have a mechanical effect: it can disperse the combustible product and thus
prevent the fire from starting again.
The fire is always fed with air, but the risk to people is limited as they can move away, except in the
case of wildfires or bushfires where they risk being easily surrounded by the flames.
Spray is aimed at a surface, or object: for this reason, the strategy is sometimes called two-
dimensional attack or 2D attack.
It might be necessary to protect specific items (house, gas tank, etc.) against infrared radiation, and
thus to use a diffused spray between the fire and the object.
Breathing apparatus is often required as there is still the risk of inhaling smoke or poisonous gases.
[edit]Closed volume fire
Until the 1970s, fires were usually attacked while they declined, so the same strategy that was used
for open air fires was effective. In recent times, fires are now attacked in their development phase as:
firefighters arrive sooner;
thermal insulation of houses confines the heat;
modern materials, especially the polymers, produce a lot more heat than traditional materials
(wood, plaster , stone, bricks, etc.).
Additionally, in these conditions, there is a greater risk of backdraft and of flashover .
Spraying of the seat of the fire directly can have unfortunate and dramatic consequences: the water
pushes air in front of it, so the fire is supplied with extra oxygen before the water reaches it. This
activation of the fire, and the mixing of the gases produced by the water flow, can create a
flashover. Template :Citation needed=November 2011
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The most important issue is not the flames, but control of the fire, i.e., the cooling of the smoke that
can spread and start distant fires, and that endangers the lives of people, including firefighters. The
volume must be cooled before the seat is treated. This strategy originally of Swedish (Mats Rosander
& Krister Giselsson) origin, was further adapted by London Fire Officer Paul Grimwood following a
decade of operational use in the busy West End of London between 1984-94 (www.firetactics.com)
and termed three-dimensional attack, or 3D attack.
Use of a diffused spray was first proposed by Chief Lloyd Layman of the Parkersburg Fire
Department, at the Fire Department Instructors Conference (FDIC) in 1950 held in Memphis.
Using Grimwood's modified 3D attack strategy, the ceiling is first sprayed with short pulses of a
diffused spray:
it cools the smoke, thus the smoke is less likely to start a fire when it moves away;
the pressure of the gas drops when it cools (law of ideal gases), thus it also reduces the mobility
of the smoke and avoids a "backfire" of water vapour;
it creates an inert "water vapour sky", which prevents roll-over (rolls of flames on the ceilingcreated by the burning of hot gases).
Only short pulses of water must be sprayed, otherwise the spraying modifies the equilibrium, and the
gases mix instead of remaining stratified: the hot gases (initially at the ceiling) move around the room
and the temperature rises at the ground, which is dangerous for firefighters. An alternative is to cool
all the atmosphere by spraying the whole atmosphere as if drawing letters in the air ("penciling").
The modern methods for an urban fire dictate the use of a massive initial water flow, e.g. 500 L/min
for each fire hose. The aim is to absorb as much heat as possible at the beginning to stop the
expansion of the fire, and to reduce the smoke. When the flow is too small, the cooling is not
sufficient, and the steam that is produced can burn firefighters (the drop of pressure is too small and
the vapor is pushed back). Although it may seem paradoxical, the use of a strong flow with an efficient
fire hose and an efficient strategy (diffused sprayed, small droplets) requires a smaller amount of
water: once the temperature is lowered, only a limited amount of water is necessary to suppress the
fire seat with a straight spray. For a living room of 50m² (60 square yards), the required amount of
water is estimated as 60 L (15 gal).
French firefighters used an alternative method in the 1970s: they sprayed water on the hot walls to
create a water vapour atmosphere and asphyxiate the fire. This method is no longer used because it
was risky; the pressure created pushed the hot gases and vapour towards the firefighters, causing
severe burns, and pushed the hot gases into other rooms where they could start a new fire.
Career is defined by the Oxford English Dictionary as a person's "course or progress through life (or a
distinct portion of life)". It is usually considered to pertain to remunerative work (and sometimes also
formal education).
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The etymology of the term comes from the m. French word carriere (16 c.) ("road, racecourse") which,
in turn, comes from the Latin word "(via) cararia" (track for wheeled vehicles) which originated from
the latin word carrus" which means "wagon".
CAREER PROFILE: 3D RIGGER
Written by admin on Jul 11th, 2011 | Filed under: Technical careers
This is a career of the 3D and animation industry. A related career is that of the animator. 3D
rigging is closely related to character animation. Basically a rig is a skeletal structure that help
control animation and movement of digital character. For example the 3D characters of animation
and movies such as Ant, Mr Incredible have bone structures. To be qualified ...
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CAREER PROFILE: SECONDHAND BOOKSTORE OWNERWritten by admin on Jul 6th, 2011 | Filed under: Sales and business-related careers
This is a career that provides self-employment opportunity. The work scope of the Second hand
bookstore owner involves buying and selling books and/or publications, used magazines, etc.
Some owners also sell a combination of new and old books as well. Before committing to putting in
large sum of money, there is a need to evaluate the market need. Much considerations are ...
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CAREER PROFILE: MAGICIANWritten by admin on Jul 3rd, 2011 | Filed under: Media-based careers
Everybody likes a few mystery. People also like to be entertained. Magic performing is a form of
entertainment field and career. A Magician is one that performs magic. Magic is an art form. Not
every one can be a magician. If everyone can be a magician, there will be no more magic ! To be
one, requires practice and dedications. To be ...
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CAREER PROFILE: FASHION MAGAZINE EDITORWritten by admin on Jun 14th, 2011 | Filed under: Writing-based career
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Fashion Magazines are very popular with females. Many women (and some men) are very fashion
and trend conscious. Popular Fashion publications include Elle Girl, Vogue. Other countries
magazines include Japanese ones such as CanCam, Classy and AneCan. A Fashion Magazine
Editor influences the style and attitude of a Fashion Magazine. The work may include establishing
connections with design house. The job ...
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CAREER PROFILE: RETIREMENT PLANNERWritten by admin on Mar 21st, 2010 | Filed under: People-centred career
After working and slogging for decades, many persons long for a nice and enjoyable retirement.
Retirement is the period of time when one no longer work for a living. He or she now enjoy the
fruits of past labours and savings. For most people living in the modern world, retirement is a
preferred old age lifestyle. Retirement planners meet up with ...
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CAREER PROFILE: PURSERWritten by admin on Feb 1st, 2010 | Filed under: Maritime-based careers
Do you like to work onboard a ship? Pursers are employed mainly on board passenger ships, cruise
ships, tankers and freighters. What are the job scopes of a Purser? The task is mainly to execute
the administration and paperworks required when a ship enters a port. Part of the job involves
currency exchange and other money matters. Assisting passengers with the ...
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CAREER PROFILE: SPORTS PSYCHOLOGISTWritten by admin on Jan 9th, 2010 | Filed under: Science and research-related careers
This is a type of psychologist that specialises in the sporting field. In a nutshell, the job involves
helping athletes and sports persons to improve or enhance their performance. The channel to do
so includes mental skill training and counselling. A sports psychologist may not be working inisolation. He or she will have to work with personnels such as coaches of ...
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