green house effect 1234
DESCRIPTION
Green house effect, Dr. Md. Salequr Rahman, Dep: of comunity medicine, Dhaka, Bangladesh.TRANSCRIPT
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Green House Effect& Exposures in Bangladesh
Presented By: Dr.Salequr Rahman
Dep. Of Community Medicine
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GREENHOUSE EFFECT
The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface, energy is transferred to the surface and the lower atmosphere.
As a result, the temperature there is higher than it would be if direct heating by solar radiation were the only warming mechanism.
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GREENHOUSE EFFECT(CONT’D)
The greenhouse effect is a warming near the Earth's surface that results when the Earth's atmosphere traps the sun's heat.The atmosphere acts much like the glass walls and roof of a greenhouse.
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Founder of Greenhouse Effect
The greenhouse effect was discovered by Joseph Fourier in 1824.
First reliably experimented on by John Tyndall in 1858.
First reported quantitatively by Svante Arrhenius in 1896.
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Green House Gases
Burning of Oil, Petrol Engine
Deforestation
IndustrializationB
urning of Fossil F
uel
CFC
NOX +Co2
NO+Co2
NOx + Co2CFC
E A R T H
Sunshine E
nter the
earth atmosphere
Afte
r abs
orbi
ng th
is
ener
gy is
sen
t bac
k in
to
the
atm
osph
ere
Heat absorbed by the
Green H
ouse Gases
Som
e of
the
ener
gy
pass
es b
ack
into
spac
e
Much of it remains trapped in the atmosphere by the greenhouse gases, causing our world to heat up
NH4
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• Human activities are enhancing the Greenhouse Effect, because we are continually adding heat-trapping greenhouse gases to the atmosphere by factory emissions, vehicle emissions, etc. Such gases include carbon dioxide, carbon monoxide, chlorofluorocarbons, methane and ozone. The table on the next slide shows some examples of natural and man-made sources of some ‘Greenhouse Gases’.
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Greenhouse Gas Natural sources Man-made sources
Carbon Dioxide Organic decay, Forest fires, Volcanoes
Burning fossil fuels – car and factory emissions, electricity generation
Methane Wetlands, Organic decay, Termites
Natural gas & oil extraction, BiomassBurning, Rice cultivation,Cattle, Refuse landfills
Nitrous Oxide Forests, Grasslands, Oceans, Soils, Soil cultivation; Fertilizers
Biomass burning; Burning of fossil fuels
Chlorofluorocarbons (CFCs) None Refrigerators; Aerosol spray propellants; Cleaning solvents
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Major adverse effects of Green House are listed below:
1. Faster Ocean warming and catastrophic sea level rising2. Polar ice caps melting3. Climate change due to Green House effect. 4. Health Problem
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CORPORATE SOCIAL RESPONSIBILITY (CSR) AGAINST GREENHOUSE EFFECT:
• Many reputed organization now taking several steps for reducing greenhouse gas effect. They are doing green management process for reducing greenhouse gas effect. Among them some of those company’s name given below-
HSBC BANK
BRITISH AND AMERICAN TOBACCO
UNILEVER
GRAMEENPHONE
“HSBC BANK” Obtain “the daily
star” green management award 2011.
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Prevention methods of the Green House Effect:
1. Use Green technology
2. reuse and recycle
3. Take steps at Home and Office
4. Learn Smarter car usage
5. Increase Social Awareness
6. Support ‘Emissions trading’
7. Support ‘Kyoto protocol’
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Impact of Greenhouse Effect on Bangladesh
• Water level rises of Bay of Bengal
• Abrupt climate change• Different skin diseases• Causes natural calamities• Impediment of agricultural
production etc.
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Prevention is better than cure. We should work towards a greener future.
Afterthought:
pollution
Save The World
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Presented By: Dr.Salequr RahmanDep. Of Community
Medicine