Green House Effect& Exposures in Bangladesh

Presented By: Dr.Salequr Rahman

Dep. Of Community Medicine

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.

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.

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.

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

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nter the

earth atmosphere

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Heat absorbed by the

Green H

ouse Gases

Som

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the

ener

gy

pass

es b

ack

into

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Much of it remains trapped in the atmosphere by the greenhouse gases, causing our world to heat up

NH4

• 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’.

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

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

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.

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’

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.

Prevention is better than cure. We should work towards a greener future.

Afterthought:

pollution

Save The World

Presented By: Dr.Salequr RahmanDep. Of Community

Medicine