Transcript of At the end of this discussing, you will know: 1.The meaning of the sick and aging world 2.Overview...
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- At the end of this discussing, you will know: 1.The meaning of
the sick and aging world 2.Overview of environmental issues occur
through the world 3.The symptom of the sick and aging world 4.The
cause of the sick and aging world 5.The cure of the sick and aging
world
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- This world being home for all creature for almost 4.6 billion
years. At this long age, this world also bear with many
uncontrolled environmental problem that effect all the nature of
life. For example, the air pollution, water pollution, chemical and
radioactive waste pollution, global warming, depletion of ozone
layer etc. This polluted world become worse and if not control from
now, our world will be dying.
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- This world was really great before any pollution take place.
The air as very fresh, the water can be drink directly, the cloud
pure white, the creature on the land and the ocean were plentiful
and all happen in perfect manner without any disturbance.
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- The sickness happen after Industrial revolution. First water
pollution occur in Netherlands, 1850. Worst air pollution occur on
1948 in Pennsylvania. Mankind use natural source to produce various
product. The use of coal lead to air pollution. Carbon dioxide
emission from burning of fossil lead to global warming.
Chlorofluorocarbons lead to depletion of ozone layer. Waste water
from factory effect the quality of water.
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- Foam on polluted canal
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- Residents of Bhopal, India, standing outside the gate of the
Union Carbide factory where a chemical leak killed thousands and
blinded many others. 8000 people died immediately. The cause is
releasing 30 tons of lethal methyl isocyanate gas to the air.
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- The Exxon Valdez leaking oil; the slick is visible along side
of ship.
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- AIR POLLUTION Acidic gases released from factories. Burning of
fossil fuels. Smoking habits. Increased usage of vehicles.
Deforestation due to urban development. NUCLEAR WASTE POLLUTION
During war, nuclear explosions and weapons harms the people in
surrounding. Improper nuclear wastes handling and disposal. Mining
of radioactive ores. Accidents in nuclear power plant cause
explosion of radioactive materials.
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- Explosions continue to rock the stricken Fukushima Daiichi
nuclear power plant in Japan, in the wake of the devastating
earthquake and tsunami.
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- WATER POLLUTION Destruction of mangroves may cause soil
erosion. Runoff from farms whereby the soil contains fertilizers
and other chemical substances. Chemical wastes dumping into the
river. Oil spills in the ocean. Discharge of animal wastes into
river which results in eutrophication.
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- OZONE LAYER DEPLETION Emission of Chlorofluorocarbons (CFCs).
Due to this problem, Ultraviolet (UV) radiation will be easily
penetrates into the Earths surface. GLOBAL WARMING High temperature
in atmosphere due to the increase concentrations of greenhouse
gases. The greenhouse effect cause: Increasing of water level.
Melting of ice. Change in weather patterns. Loss of snow cover.
Deforestation will cause lack of oxygen in atmosphere.
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- AIR POLLUTION (Steps individuals can take) Choose lower
polluting paints Plant a tree Barbecue with gas Use your
electricity efficiently Wet down or cover piles of dirt
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- AIR POLLUTION (Methods/machinery that can be used) Dust
collector Cyclonic separation Cyclonic spray scrubbers Baffle spray
scrubbers
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- . WATER POLLUTION (At home) Boiling and Filtering-It kills
bacteria, spores, ova, cysts and sterilizes water. Chlorine
tablets-Chemical Disinfection. Chlorine Solution-purifying stored
water. Bleaching Powder-disinfect water.
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- . WATER POLLUTION (At Urban Scale) Sewage treatment consists of
following steps Sedimentation (Primary treatment) Activated sludge
biotreaters (Secondary treatment) Constructed wetlands (also used
for urban runoff) Natural wetlands act as a biofilter, removing
sediments and pollutants such as heavy metals from the water.
Industrial wastewater treatment consists of: API oil-water
separators Biofilters Ultrafilteration
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- . TOXIC WASTE HANDLING Land disposal: Waste is buried in
landfills which should be permanently sealed to contain the waste.
Landfills may be lined with clay or plastic, or waste may be
encapsulated in concrete. However, there is no guarantee that a
leak will not occur. Incineration (burning): May be low temperature
(urban refuse) or high temperature incineration. The latter is best
for many industrial wastes (tar, paint, pesticides, solvents) as it
prevents formation of dioxins. High temperature incineration is not
yet available in South Africa. Chemical or biological: Chemicals
are added to waste, and they make it less toxic; or bacteria "eat"
the waste, resulting in a less toxic residue.