Introduction
Global Warming
Changes both Modernize and Pollute Our Environment
As times goes on, any more chemical changes are applied by science and technology to make the people achieve more in less time and minimize the hassles of ordinary chores.
For example, there are more modern and big buildings. We can use electrical energy to make our work easier and faster. We have more comfortable vehicles now. More air-conditioned buses and taxis are available as we travel.
The big shopping malls offer a variety of good products which are most efficient, durable,, and cheaper
However, as more modern products and facilities are made through scientific modernization, planet Earth becomes more polluted.
One of the biggest global problems is waste disposal. Because of the advancement in chemical researchers, many solid products now are nonbiodegradable. That is they do not decay. The result is
Mountains of garbage which do not decompose
Global warming
You have learned that carbon dioxide from the air is taken by plants, and converted into food and oxygen. However, as more and more forest are destroyed, fewer plants are left to take n the carbon dioxide for use in photosynthesis. On the other hand, people keep n using energy and fuel and burning materials that produce more and more carbon dioxide. There is therefore a surplus of carbon dioxide in the air.
Carbon dioxide is one of the major greenhouse gases in the atmosphere. These gases warm our atmosphere by converting solar infrared radiation into heat energy. Heat is also trapped by these greenhouse gases. Higher global temperature will cause the sea level to rise. It will also cause extreme weather conditions such as super typhoons and tornadoes.
Acid rain
normally, rain s good for people, animals, and plants. However, as re industries release gaseous pollutants into the air, the rain that now falls on the earth’s surface is no longer clear. It is tainted with acids coming from many industries producing sulfur oxide and nitrogen dioxide.
Ozone depletion describes two distinct but related phenomena observed since the late 1970s: a steady decline of about 4% in the total amount of ozone in Earth's stratosphere (the ozone layer), and a much larger springtime decrease in stratospheric ozone around Earth's polar regions.[1] The latter phenomenon is referred to as the ozone hole. In addition to these well-known stratospheric phenomena, there are also springtime polar tropospheric ozone depletion events.
The details of polar ozone hole formation differ from that of mid-latitude thinning but the most important process in both is catalytic destruction of ozone by atomic halogens.[2] The main source of these halogen atoms in the stratosphere is photodissociation of man-made halocarbon refrigerants, solvents, propellants, and foam-blowing agents (CFCs, HCFCs, freons, halons). These compounds are transported into the stratosphere by winds after being emitted at the surface.[3] Both types of ozone depletion were observed to increase as emissions of halocarbons increased.
CFCs and other contributory substances are referred to as ozone-depleting substances (ODS). Since the ozone layer prevents most harmful UVB wavelengths (280–315 nm) of ultraviolet light (UV light) from passing through the Earth's atmosphere, observed and projected decreases in ozone generated worldwide concern, leading to adoption of the Montreal Protocol that bans the production of CFCs, halons, and other ozone-depleting chemicals such as carbon tetrachloride and trichloroethane. It is suspected that a variety of biological consequences such as increases in sunburn, skin cancer, cataracts, damage to plants, and reduction of planktonpopulations in the ocean's photic zone may result from the increased UV exposure due to ozone depletion.
Ozone (systematically named 1λ1,3λ1-trioxidane and catena-trioxygen), or trioxygen, is an inorganic molecule with the chemical formula O
3. It is a pale blue gas with a distinctively pungent smell. It is anallotrope of oxygen that is much less stable than the diatomic allotrope O
2, breaking down in the lower atmosphere to normal dioxygen. Ozone is formed from dioxygen by the action of ultraviolet light and also atmospheric electrical discharges, and is present in low concentrations throughout the Earth's atmosphere (stratosphere). In total, ozone makes up only 0.6 ppm of the atmosphere.
Harmful effects of Ozone depletion
as the ozone layer breaks down, it becomes less effective as a barrier against harmful ultraviolet rays. If more harmful ultraviolet radiation reaches the earth's surface, the following will happen.
1. The planktons will die. Planktons are tiny marine organisms which produce 80% of oxygen we breathe. it is also the food of the corals that form the coral reefs. If the corals starve, the reefs will disappear. There will be less hatcheries and nurseries of marine animals. We shall have less protein food such as fish,shellfish,crabs and lobster.
2. Overexposure to harmful ultraviolet rays can cause painful eye iritation or eye inflamation.
3. Too much ultraviolet radiation can damage or kill plants. Less plants will ultimately lead to lesser food for human consuption. It also means less fresh air and higher air temperature.
Task
Some of you are not aware on what is happening in our surroundings. In this activity you will learn a lot of things. You will be provided by some questions.
- What can you observe in our climate now compare from the past?
- What do you think the cause of it?
- What is Global Warming?
- As a student what can you do to save earth?
Task 1
You will make a list of the causes of Global Warming and ozone depletion. Make the ways to do to prevent the total depletion of ozone layer.
Task2
What will happen to us if we ignore all the changes in our environment? (find pictures)
Find the illustration of formation of acid rain.
Process
Evaluation
Task 3
Make your Slogan Theme: Save our Home the earth! Be creative make this to encourage people/wake people to make difference.
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Conclusion
Good Job! You already learned about what’s happening right now. You can now share the knowledge you gained for the to be able to help our world. It’s not too late you as a student can make a difference. Continue to spread your learnings.
Youve learned that the improper waste disposal and different chemicals produced by the big buildings and vehicles can make our ozone layer thin. Acid rain is tainted with acids coming from many industries producing sulfur oxide and nitrogen dioxide. Youve learned whtat are the things to do to help the prevention of ozones destruction.
Credits
Teacher Page
Dear Readers , education is very important for your success. Youve learned that caring our environment is also important. You can now share the thngs youve learned now. I hope youve learned a lot. Thank You for visiting my page. Godbless
prepared by:
MARY RHOTSIE E. LOPEZ
BACHEOR OF SECONDARY STUDENT
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