Green house effect 1234


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Green house effect, Dr. Md. Salequr Rahman, Dep: of comunity medicine, Dhaka, Bangladesh.

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Green house effect 1234

  1. 1. Green House Effect & Exposures in Bangladesh Presented By: Dr.Salequr Rahman Dep. Of Community Medicine
  2. 2. 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.
  3. 3. 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.
  4. 4. 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.
  5. 5. Green House Gases NH4 Much of it remains trapped in the atmosphere by the greenhouse gases, causing our world to heat up Industrialization Burning of Fossil Fuel NOX +Co2 CFC CFC NOx + Co2 Burning of Oil, Petrol Engine NO+Co2
  6. 6. • 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’.
  7. 7. 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, Biomass Burning, 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
  8. 8. 1. 2. 3. 4. Faster Ocean warming and catastrophic sea level rising Polar ice caps melting Climate change due to Green House effect. Health Problem
  9. 9. • 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 “HSBC BANK” Obtain “the daily star” green management award 2011. BRITISH AND AMERICAN TOBACCO UNILEVER GRAMEENPHONE
  10. 10. 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’
  11. 11. • Water level rises of Bay of Bengal • Abrupt climate change • Different skin diseases • Causes natural calamities • Impediment of agricultural production etc.
  12. 12. Afterthought: Prevention is better than cure. We should work towards a greener future. Save The World
  13. 13. Presented By: Dr.Salequr Rahman Dep. Of Community Medicine