Green House Effect & Climate

Change

Presented By:

Tasif Ahmed

What is a GREENHOUSE ?

• Greenhouses are special buildings usually made from glass & steel. They are used to grow plants which need humidity, tropical temperature & constantg rowing condition.

• In a glass greenhouse heat builds up & gets trapped due to presence of CO2. It offers plants a warm and humid environment, even if the outside weather is dry , windy or cold.

Causes of Greenhouse Effect

• Natural greenhouse gases

• Man made greenhouse gases

Natural Greenhouse Gases

• N2 and O2 do not have absorption in the IR light , therefore, it has no role in setting the surface temperature of the planet .

• Greenhouse gas are efficient in absorbing IR light• The most important greenhouse gases are :• H20 – water vapor• CO2- Carbon Dioxide• CH4- Methane• NH4 – Nitrous Oxide• The most abundant gas in the earth’s atmosphere is water

vapor . It trapped the IR radiation.

Man Made Greenhouse Gases

Along with natural processes, there are some man made greenhouse keep on increasing in the atmosphere.

• Burning of fossil fuels , coal , oil , natural gas etc.

• Deforestation

• Generate lot of CO2 disturbs the balance of greenhouse gases in the atmosphere.

• Use of aerosols , hairspray cans , fridges , plastics etc produce a group of highly dangerous gas

called CFC which is so harmful for atmosphere. Even small amounts can trap a large quantites of heat , making the earth extremely hot. This is

known as global warming.

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

Green House Gases

Burning of Oil, Petrol Engine

Deforestation

Industrialization

Burning of Fossil Fuel

CFC

NOX +Co2

NO+Co2

NOx + Co2CFC

E A R T H

Sunshine Enter

the earth

atmosphere

Afte

r abs

orbi

ng th

is

ener

gy is

sen

t bac

k

into

the

atm

osph

ere Heat absorbed by

the Green House

Gases

Some of the energy passes back into space

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

NH4

Burning of Oil, Petrol Engine

Impact of Greenhouse Effect on Bangladesh

• Water level rises of Bay of Bengal• Climate change• Causes skin diseases• Impediment of

agricultural production

•Climate changes

•Changes in wildlife adaptations and cycles

•Melting of polar ice caps

• Increase in sea level

•Flooding in coastal areas

•Ocean Acidification

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’

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

Afterthought:

pollution

Save The World