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1 THE GREENHOUSE EFFECT AND THINNING OF THE OZONE LAYER ON THE ECOSYSTEM NAME:NOOR SHAHIRAH BTNORDIN CLASS:4 HAWA TEACHER: PN..ROHAIZA BT. BAHARI

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THE GREENHOUSE EFFECT AND THINNING OF THE

OZONE LAYER ON THE ECOSYSTEM 

NAME:NOOR SHAHIRAH BTNORDIN

CLASS:4 HAWA

TEACHER: PN..ROHAIZA BT. BAHARI

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THE GREENHOUSE EFFECT.

What is greenhouse effect 

Greenhouse gases warm the atmosphere, thermal

radiation is absorbed by the planet and the temperature

increases. This phenomenon is called greenhouse effect

as its mechanisms are similar to the processes which

occur in a greenhouse. In this case the atmosphere of the

planet functions as glasswhich enables to heat the

surface from one side and from the other side it absorbs heat emitted by the surface

thereby causing global increase in temperature. To be brief, the atmosphere andgases it includes allow the radiation emitted by the Sun to get inside; however, at

the same time, they trap the radiation of the heatedEarth and do not allow it to

escape and direct it towards the surface again. We receive the same amount of 

energy but the accumulation of the compounds which trap the Earth radiation in theatmosphere favors the increase in temperature.

Gases and aerosols are responsible for this.

Greenhouse effect is a thoroughly natural phenomenon which was observed not

only on the Earth but also on other celestial bodies in our solar system, namely onMars, Venus and Titan (moon of Saturn).

Natural greenhouse effect  

The greenhouse effect is essential to life on our planet. Due to the ability to

absorb and trap part of heat, it was possible for life to be created and survive. The

greenhouse effect, owing to the specific role of atmosphere on every planet, is a

natural phenomenon. Only on the Earth it takes on alarming proportions due to

human activity. Natural heating of the planet is the effect of heat exchange. Thisprocess looks as follows: solar radiation carries thermal energy, when it reaches the

Earth, it heats the atmosphere and the surface; water, forests and

wholeenvironment are heated as well. The Earth does not absorb the whole

radiation, some of it is reflected; every light surface which reflects light also

reflects thermal energy. This process is increased by some compounds and

formations contained in the air (clouds, some aerosols). On the other hand, clouds

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and some gases let in and absorb energy thereby increasing temperature. Heating is

not a one-way process. Ultraviolet objects heated by radiation emit all or part of 

radiation in a reverse process - long-wave infrared radiation. But for the atmosphere

and the presence of compounds limiting the emission outside, all radiation would

be transmitted to space. Nevertheless, the returned emission is stopped, heat

balance of the Earth is positive, i.e. the amount of heat which reaches the Earth

exceeds the amount of heat which leaves the Earth. This process leads to increase in

temperature.

The causes of the greenhouse effect  

The atmosphere of our planet is the air which is the mixture of various gases and

aerosols. The composition of the atmosphere depends on the height. To put it

simply, this is a composite mixture of gases. The most common gases are nitrogen

(over 78%) and oxygen (28%). Other gases constitute only a fraction of the wholemixture; however, we cannot ignore their importance.

The main greenhouse gas is water vapour. According to scientists, it is

responsible for the greenhouse effect in 30 to 60 per cent. The amount of the

vapour in the atmosphere is not fixed and it fluctuates depending on a time of the

day, season or area. Clouds are made of vapour, its presence can be easily stated

with our own eyes. The vapour is also significant due to the fact that, on one hand,

it absorbs perfectly some solar radiation and, on the other hand, it substantially

limits heat return in the form of infrared radiation. Its presence in the atmosphere is

the result of evaporating water: seas, lakes, oceans and also evaporating water fromground, plants and other organisms. The atmosphere is cleaned by rainfall and the

process of vapour exchange and water cycle in the nature is dependant on

temperature: the higher temperature the higher water evaporation rate; as a result

the content of water vapour in the air increases and so does the greenhouse effect.

Another greenhouse gas is carbon dioxide. It was discovered in the atmosphere a

long time ago and it is one of the factors responsible for life-friendly temperature.

However, as the result of the emission of carbon dioxide in the process of fuel

burning and forest burning, its greenhouse effect increases and so does its influence

on climate. Carbon dioxide is responsible for the greenhouse effect at about 9 to

26% and the ability to absorb infrared radiation is 1. Methane has a considerable

influence on climate warming. This gas is produced in natural processes, mainly by

bacteria which decompose organic matter (remains of plants and animals). The

excess of methane in the air and thereby enhancing the greenhouse effect are

caused by mining industry and stockpiles of organic waste (dumps). The ability of 

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methane to absorb infrared radiation is thirty times higher than the ability

of  carbon dioxide.

Other gases which cause and enhance the greenhouse effect (as a result of 

emission caused by people) are nitric oxides, including nitrous oxide, ozone and

CFCs. The ability of nitrous oxide to absorb thermal radiation is 150 higher thanthe ability of carbon dioxide; this gas is produced in the emission of exhaust fumes

and while using nitric fertilizers in farming.

Ozone, which is the protective ozone sphere in upper layers, in lower layers

prevents heat produced on the Earth from escaping and its absorbency is 200 times

higher than the same abilities of carbon dioxide. The content of greenhouse ozone

increases due to chemical reactions of carbon monoxide, hydrocarbons and nitric

oxides emitted in industrial burning processes.

And finally CFCs which are not natural as they were produced by people.

Although there are not many CFCs in the air, their ability to trap radiation is from

ten to twenty thousand higher than the ability of carbon dioxide.

Greenhouse effect and global warming 

The issue of the greenhouse effect on climate change is debatable even in a

scientific environment. Nevertheless, it is widely assumed that the greenhouse

effect or its intensification resulting from human activity, has impact on global

warming. The facts are clear: within the space of one century, i.e. from thebeginning of the 20th century to the beginning of the 21st century, average

temperature increased by 0.7%. What is more, there was a rise in the emission of 

carbon dioxide and other greenhouse gases. The estimated probability that it was

caused by human activity and not by natural reasons is 90% (data from IV Report

of the Intergovernmental Panel on Climate  Change). Scientists who are skeptical

about this theory claim that this change was caused by change in the activeness of 

the Sun which always influenced our planet, even before the intensification of 

human industrial activity.

There are other examples of climate change, such as a rise in averagetemperature on poles (the Arctic - average yearly temperature increased by 3

oC and

by 7oC in winter), changes in a moderate climate - which can be observed in hot

summers and relatively warm winters. Furthermore, climatic zones are shifting to

the Equator and, as a result, areas on which droughts occur are extending.

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If this process continues, in the next century the consequences will be much

more worrying: permafrost melting will cause the creation of bogs which

consequently will increase the emission of methane and carbon dioxide. Due to the

increase in the amount of carbon dioxide and methane in the air, the temperature of 

the Earth will rise by about 2oC which will influence ice melting and cause level of 

water to rise, as a result vast areas of the Earth will be threatened with flooding.From 1880 to 1990 the level of seas and oceans increased by about 11 cm.

Air circulation may be disturbed, climatic zones will shift, we will lose huge

areas of farming lands and forest areas. Paradoxically global warming may lead to

another Ice Age (ice melting will prevent warm sea currents).

To sum up, scientists agree that the greenhouse effect enhanced by people will

speed up the process of global warming and global climate changes which may lead

to unpredictable consequence in the future - even extermination of humankind andlife on the Earth.

Forests and greenhouse effect  

One of the main greenhouse gases responsible for the greenhouse effect,

examples, gases which absorb heat and trap it in the Earth atmosphere, is carbon

dioxide. It is widely known that this gas is converted into oxygen by plants

(photosynthesis). It means that the presence of carbon dioxide in the air is closely

associated with the condition of plants on the Earth. Being a treasure trove of plants

and lungs of our planet, forests are of great importance.

Most of forest areas have been destroyed and some of them are still being

destroyed due to territorial expansion. They are cut down and burnt down. As a

result of both processes we lose vast areas of forests which regulate gas and thermal

economy of our planet. By burning forests we contribute to increase in the emission

and concentration of carbon dioxide in the atmosphere.

Forests also absorb humidity thereby protecting the air from the excess of carbon

dioxide. High humidity facilitates storing carbon dioxide in lower layers of the

atmosphere owing to which it is kept in forests and does not escape to higher layerswhere it could cumulate heat. According to scientists' opinion, about 15% of the

emission of carbon dioxide to the atmosphere is the effect of the destruction of forest areas.

Another problem connected with the greenhouse effect is destruction of rain

forests. Not only are these huge green areas the treasure trove of nature and a place

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where oxygen is produced, they also regulate the amount of heat and light absorbed

and reflected by the Earth. The ration of light reflection is called albedo. The colors

of forests are dark so they absorb light radiation. If forests are destroyed, the light is

reflected. Significant changes in the albedo ration influence winds, sea currents and

rainfall, in other words, they cause climatic changes.

TINING OF THE OZONE LAYER ON THE ECOSYSTEM

What is the ozone hole

The phenomenon of the ozone hole was first observedin the 1980s over the Antarctic. The ozone hole is the

ozone depletion in the upper layer of the Earth's

atmosphere, so-called stratosphere. It is said that the

ozone loss is about 50% due to the emission of 

compounds which cause a ozone depletion - particularly

CFC - the protective ozone layer was damaged at theheight of 10 to 50 kilometers.

Research demonstrated that during the last several years the concentration of ozone in the atmosphere fell by 0,2% per annum. The phenomenon is called the

ozone hole extension. What is worse, it appears not only over the Antarctic but also

over other areas on the Earth.

Effects on Human Health

Laboratory and epidemiological studies demonstrate that UVB causes

nonmelanoma skin cancer and plays a major role in malignant melanoma

development. In addition, UVB has been linked to cataracts -- a clouding of the

eye’s lens. All sunlight contains some UVB, even with normal stratospheric ozonelevels. It is always important to protect your skin and eyes from the sun. Ozone

layer depletion increases the amount of UVB and the risk of health effects.

EPA uses the Atmospheric and Health Effects Framework (AHEF) model,

developed in the mid 1980s, to estimate the health benefits of stronger ozone layer

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protection policies under the Montreal Protocol. EPA estimates avoided skin cancer

cases, skin cancer deaths, and cataract cases in the United States.

Effects on Plants

Physiological and developmental processes of plants are affected by UVB

radiation, even by the amount of UVB in present-day sunlight. Despite mechanisms

to reduce or repair these effects and a limited ability to adapt to increased levels of 

UVB, plant growth can be directly affected by UVB radiation.

Indirect changes caused by UVB (such as changes in plant form, how nutrients are

distributed within the plant, timing of developmental phases and secondary

metabolism) may be equally, or sometimes more, important than damaging effectsof UVB. These changes can have important implications for plant competitive

balance, herbivory, plant diseases, and biogeochemical cycles.

Effects on Marine Ecosystems

Phytoplankton form the foundation of aquatic food webs. Phytoplankton

productivity is limited to the euphotic zone, the upper layer of the water column in

which there is sufficient sunlight to support net productivity. The position of the

organisms in the euphotic zone is influenced by the action of wind and waves. Inaddition, many phytoplankton are capable of active movements that enhance their

productivity and, therefore, their survival. Exposure to solar UVB radiation has

been shown to affect both orientation mechanisms and motility in phytoplankton,

resulting in reduced survival rates for these organisms. Scientists have

demonstrated a direct reduction in phytoplankton production due to ozone

depletion-related increases in UVB. One study has indicated a 6-12% reduction in

the marginal ice zone.

Solar UVB radiation has been found to cause damage to early developmental stages

of fish, shrimp, crab, amphibians and other animals. The most severe effects aredecreased reproductive capacity and impaired larval development. Even at current

levels, solar UVB radiation is a limiting factor, and small increases in UVB

exposure could result in significant reduction in the size of the population of 

animals that eat these smaller creatures.

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Effects on Biogeochemical Cycles

Increases in solar UV radiation could affect terrestrial and aquatic biogeochemical

cycles, thus altering both sources and sinks of greenhouse and chemically-

important trace gases e.g., carbon dioxide (CO2), carbon monoxide (CO), carbonyl

sulfide (COS) and possibly other gases, including ozone. These potential changes

would contribute to biosphere-atmosphere feedbacks that attenuate or build up of 

these reinforce the atmospheric gases.

Effects on Materials

Synthetic polymers, naturally occurring biopolymers, as well as some other

materials of commercial interest are adversely affected by solar UV radiation.

Today's materials are somewhat protected from UVB by special additives.

Therefore, any increase in solar UVB levels will therefore accelerate their

breakdown, limiting the length of time for which they are useful outdoors.

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More Information

 Environmental Effects of Ozone Depletion and Its Interactions with Climate

Change: 2010 Assessment 

This report by the experts who comprise the Environmental and Health

Effects Assessment Panel (appointed under the Montreal Protocol) explains

the effects of ozone depletion on human and environmental health.

 Q&A on the effects of the depletion of the ozone layer on humans and the

environment 

Answers to SunWise program about health effects linked to UV exposure, frequently

asked questions about the impact of ozone layer depletion on human health

and the environment. These questions and answers were prepared by the

experts who comprise the Environmental and Health Effects Assessment

Panel (appointed under the Montreal Protocol).

 Health Effects of Ozone Depletion

A detailed explanation from EPA's including skin cancer, other skin

problems, cataracts, and immune system suppression.

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Greenhouse gases are trapped and build up in the atmosphere near the

earth’s surface. This makes the earth warmer than normal. The warning

effect of the trapped greenhouse gases causes changes in the weather

patterns on a global scale. Rainfall pattern changes, sea level rises and

droughts prevail.

Image via Wikipedia 

The greenhouse effect refers to the phenomenon whereby earth’s

temperature increases as a result of heat being trapped in its

atmosphere. The greenhouse gases are gasses that trap heat and

then warm up earth with this heat. These gases include carbon dioxide,

carbon monoxide, methane and CFC. The percentage of carbon dioxide

has been increasing over the past 10 years due to the increasing usage of

fossil fuels.

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http://u.nu/2gmw 

or: http://u.nu/7gmw 

Greenhouse effect can be likened to the glass house effect. The glass

house is used in countries with four seasons for agricultural purposes. It

allows light to penetrate but disallows the reflection of heat energy. This

creates a warming effect. Greenhouse gases include carbon dioxide,

nitrogen oxides and methane. The trapped heat energy increases theearth’s temperature. The warming of the earth which is referred to as

the green house effect leads to the following negative effects a) Melting of

ice at the poles b) Increase in sea level c) Climatic changes d) Increase in

the rate of disease outbreak for example diseases like malaria dengue

fever.

Global Warming

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Read more in Ecology 

« Pythons in the Backyard of America: The Menace of an Invasive Species  

The Adaptations of Animals » 

Image via Wikipedia 

Greenhouse gases are trapped and build up in the atmosphere near theearth’s surface. This makes the earth warmer than normal. The warning

effect of the trapped greenhouse gases causes changes in the weather

patterns on a global scale. Rainfall pattern changes, sea level rises and

droughts prevail.

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The Thinning of the Ozone Layer

http://u.nu/5imw 

or: http://u.nu/2imw 

Ozone which forms a layer in the stratosphere is made up of three atoms of

oxygen (O3). Stratospheric ozone protects the Earths’ surface from highlevels of biologically damaging ultraviolet (UV) radiation.

Chlorofluorocarbons (CFC), the main made chemicals, are implicated in

ozone loss. CFCs are a group of compounds made from chlorine (C1),

fluorine (F) and carbon (C). They are by products of industrial activity, not

poisonous, they cannot be burnt and are very stable because are not

reactive with other compounds.

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Image via Wikipedia 

CFC’s are not broken down in the troposphere. They are able to reach the

stratosphere (where the ozone is). Because of their physical characteristics,

CFC are ideal for many industrial processes a) CFCs and use as a coolant

in refrigerators, in air conditioners for automobiles, hoses and buildings.

This CFC will only be released into the atmosphere when the coolant isbroken. Alternative coolant compounds are now available which do not

damage the ozone layer b) for manufacturing foam used for packing

materials, mattresses and insulation. CFCs are released into the

atmosphere during the manufacture during the manufacture processes c)

used as propellants in aerosol cans in the cosmetic industry, and in

insecticides. CFCs are released into the atmosphere when an aerosol is

used. This can be overcome by using an alternative like oxygen instead of

the propellant gases used in aerosols or to use aerosols with a pump

system.

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http://u.nu/8b89 

or: http://u.nu/3kmw 

CFCs are extremely stable compounds. But when they reach the

stratosphere CFCs are broken down by ultraviolet rays. This is how CFC

depletes the ozone layer in the stratosphere a) Ultraviolet rays strikes aCFC molecule causing a chlorine atom to break away b) the free chlorine

atom then collides with an ozone molecule and combines with an oxygen

atom to form chlorine monoxide leaving an oxygen molecule.

http://u.nu/6rmw 

or: http://u.nu/4rmw 

c) when a free oxygen atom then collides with chlorine monoxide two atoms

of oxygen. The free chlorine atom continues to destroy the ozone

molecules. Thus it is advisable to avoid long periods of exposure to direct

sunlight d) an increase in ultraviolet rays harms the ecosystem by

interfering with nitrogen assimilation by microorganisms. Nitrogen is an

important element in the synthesis of protein. This will cause the decline in

rice production and other cultivated crops.

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http://u.nu/8b89 

or: http://u.nu/2mmw 

Ways to Reduce Ozone Depletion

Image via Wikipedia 

Reduce the use of CFC and replace CFC with HCFC

(Hydrochloroflurocarbon). Deactivate CFC before release into the

atmosphere. Reduce the usage of materials that uses ozone depletingsubstances like tetra-chloromethane and methyl-chloroform in the

production of polystyrene.

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What is the meaning of green house effect?

Green house effect is a process in atmospheric physics that traps heat in the Earth's

atmosphere. It is the result of physical interaction between components of the atmosphere

(greenhouse gases) and incoming sunlight.

It is not a layer of carbon dioxide in the sky that reflects heat back down as it radiates from

the Earth's surface. Heat is absorbed by the carbon dioxide all through the atmosphere and the

warmer gas "shares" its heat with all the atmospheric gases increasing the average

atmospheric temperature

Greenhouse gases are trapped and build u p in the atmosphere near the earth’s surface. This

makes the earth warmer than normal. The warning effect of the trapped greenhouse gases

causes changes in the weather patterns on a global scale. Rainfall pattern changes, sea level

rises and droughts prevail.

The greenhouse effect refers to the phenomenon whereby earth’s temperature increases as a

result of heat being trapped in its atmosphere. The greenhouse gases are gasses that trap heat

and then warm up earth with this heat. These gases include carbon dioxide, carbon monoxide,

methane and CFC. The percentage of carbon dioxide has been increasing over the past 10

years due to the increasing usage of fossil fuels.

Greenhouse effect can be likened to the glass house effect. The glass house is used in

countries with four seasons for agricultural purposes. It allows light to penetrate but disallows

the reflection of heat energy. This creates a warming effect. Greenhouse gases include carbondioxide, nitrogen oxides and methane. The trapped heat energy increases the earth’s

temperature. The warming of the earth which is referred to as the green house effect leads to

the following negative effects a) Melting of ice at the poles b) Increase in sea level c)

Climatic changes d) Increase in the rate of disease outbreak for example diseases like malaria

dengue fever.

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Global Warming

Greenhouse gases are trapped and build up in the atmosphere near the earth’s surface. This

makes the earth warmer than normal. The warning effect of the trapped greenhouse gases

causes changes in the weather patterns on a global scale. Rainfall pattern changes, sea level

rises and droughts prevail.

The Thinning of the Ozone Layer

Ozone which forms a layer in the stratosphere is made up of three atoms of oxygen (O3).

Stratospheric ozone protects the Earths’ surface from high levels of biologically damaging

ultraviolet (UV) radiation. Chlorofluorocarbons (CFC), the main made chemicals, are

implicated in ozone loss. CFCs are a group of compounds made from chlorine (C1), fluorine

(F) and carbon (C). They are by products of industrial activity, not poisonous, they cannot be

burnt and are very stable because are not reactive with other compound.

CFC’s are not broken down in the troposphere. They are able to reach the stratosphere (where

the ozone is). Because of their physical characteristics, CFC are ideal for many industrial

processes a) CFCs and use as a coolant in refrigerators, in air conditioners for automobiles,

hoses and buildings. This CFC will only be released into the atmosphere when the coolant is

broken. Alternative coolant compounds are now available which do not damage the ozone

layer b) for manufacturing foam used for packing materials, mattresses and insulation. CFCs

are released into the atmosphere during the manufacture during the manufacture processes c)

used as propellants in aerosol cans in the cosmetic industry, and in insecticides. CFCs are

released into the atmosphere when an aerosol is used. This can be overcome by using an

alternative like oxygen instead of the propellant gases used in aerosols or to use aerosols with

a pump system.

CFCs are extremely stable compounds. But when they reach the stratosphere CFCs are

broken down by ultraviolet rays. This is how CFC depletes the ozone layer in the stratosphere

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a) Ultraviolet rays strikes a CFC molecule causing a chlorine atom to break away b) the free

chlorine atom then collides with an ozone molecule and combines with an oxygen atom to

form chlorine monoxide leaving an oxygen molecule.

c) when a free oxygen atom then collides with chlorine monoxide two atoms of oxygen. The

free chlorine atom continues to destroy the ozone molecules. Thus it is advisable to avoid

long periods of exposure to direct sunlight d) an increase in ultraviolet rays harms the

ecosystem by interfering with nitrogen assimilation by microorganisms. Nitrogen is an

important element in the synthesis of protein. This will cause the decline in rice production

and other cultivated crops.

Ways to Reduce Ozone Depletion

Reduce the use of CFC and replace CFC with HCFC (Hydrochloroflurocarbon). Deactivate

CFC before release into the atmosphere. Reduce the usage of materials that uses ozone

depleting substances like tetra-chloromethane and methyl-chloroform in the production of 

polystyrene.