global warning, climate change, ozone layer md. mizanur rahman · • “global warming is a total,...
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Global warning, Climate change, Ozone layer
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Md. Mizanur Rahman MEng(Sweden), PhD (Finland), CEng Chartered Energy Engineer (EI, UK) Certified Energy Manager School of Mechanical Engineering Universiti Teknologi Malaysia Email: [email protected]
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Ts = 14+273.15 K = 287.15 K
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Note: In contrast to the warming effect of the higher clouds, low stratocumulus clouds act to cool the Earth, because they reflect much of the solar energy back to space.
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Conservation of mass, momentum and energy
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• Ozone (O3)
• A gas composed of three
atoms of oxygen
• Bluish gas that is harmful to
breathe
• Nearly 90% of earth’s ozone
is in the stratosphere and
referred to as the ozone layer
• Ozone absorbs a band of
ultraviolet radiation called
UVB.
Ozone layer depletion
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Chemicals which responsible for destroying OZONE layer
• CFC (Chlorofluorocarbon)
• HCFC (Hydrochlorofluorcarbons)
• HFC (Hydrofluorocarbons)
• HC (Hydrocarbons)
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R-134A belongs to a group of chemicals called hydrofluorocarbons (HFCs))
1. Global warming
2. Natural greenhouse effect
3. Enhanced greenhouse effect due to anthropogenic emissions,
particularly CO2
4. Climate change: Change in temperature, humidity, atmospheric
pressure, wind, precipitation, atmospheric particle count and other
meteorological variables
5. Natural variability continues along with anthropogenic changes
6. Sea level rise as a result of the warming
7. Ocean acidification: ”the other CO2 problem”
8. Ozone layer depletion
US President Trump says:
• “Global warming is a total, and very expensive Hoax.”
• “The concept of global warming was created by and for the Chinese
in order to make U.S. manufacturing non-competitive”.
• “Global warming is based on faulty science and manipulated data”.
• “It’s extremely cold in NY & NJ—not good for flood victims.
Where is global warming?”
Discuss with your friends and give your opinion