presentation on greenhouse effect & climate change
TRANSCRIPT
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