Global warming


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  • In examining global warming, we will be looking at questions such as  Is the world getting warmer?  If so, are the actions of mankind to blame for earth’s temperature increases?  What can or should be done about global warming?  Are the potential resolutions to global warming worth the cost to implement them? 
  • This is a big picture examination of the earth’s climate  The Earth was formed around 4.6 billion years ago  And was originally very hot  However, the Sun’s energy output was only 70% of what it is presently  Liquid water was present on the surface around 4.3 billion years ago 
  • The temperature of the earth is directly related to the energy input from the Sun.  Some of the Sun’s energy is reflected by clouds.  Other is reflected by ice. The remainder is absorbed by the earth. 
  •  However, if the amount of solar energy is greater than the amount radiated, then the earth heats up. 
  • Likewise, the earth’s atmospheric gases affect the ability of the earth to radiate the Sun’s energy back into space.  Nitrogen and  Oxygen  make up 99% of the earth’s atmospheric gases  and are non-greenhouse gases.  Water,  Carbon Dioxide,  and Methane  make up 1% of the earth’s atmosphere,  but are greenhouse gases, since they cause the earth to retain heat. 
  • Despite this rapid increase in  carbon emissions, only about  half the carbon can be detected in the atmosphere. The remainder of the carbon dioxide is being dissolved in the oceans or incorporated into trees. 
  • Global warming

    1. 1. Global Warming The Big Issue… By: Banibrata Pal (INDIA)
    2. 2. Is The World Getting Warmer?
    3. 3. History of Earth’s Climate • Earth formed ~4.6 billion years ago • Originally very hot • Sun’s energy output only 70% of present • Liquid water present ~4.3 billion years
    4. 4. Sun Earth’s Temperature Solar Energy Solar Energy
    5. 5. Sun Earth’s Temperature Solar Energy Radiation Cooling
    6. 6. Earth’s Atmospheric Gases Nitrogen (N2) Oxygen (O2) Water (H2O) Carbon Dioxide (CO2) Methane (CH4) Non- Greenhouse Gases 99% Greenhouse Gases 1%
    7. 7. Annual Carbon Emissions Annual carbon emissions Atmospheric CO2 Atmospheric CO2 average 1955 1965 1975 1985 1995 2005 0 4 6 8 2 Year Carbon(109 metrictons)
    8. 8. • Vehicles • Home Heating • Electricity Households are Big Contributors to Climate Change
    9. 9. So how can each of us slow global warming now?
    10. 10. Because greenhouse gas emissions are tied very closely to our energy consumption, using less fossil fuel based energy puts fewer greenhouse gases into the atmosphere. This will help slow global warming. Reduce our consumption of fossil fuels (
    11. 11. We can make some simple substitutions Replacing just 1 incandescent light bulb with 1 compact florescent bulb saves about 150 pounds of carbon dioxide per year! Source:
    12. 12. Small changes really add up Replace your old refrigerator with a new Energy Star: Annual savings: $90; 700 pounds CO2 Set your thermostat down a few degrees in the winter Annual savings: $135; 1400 pounds CO2 Wash clothes in cold water only Annual savings: $70; 500 pounds CO2 Drive JUST 10 fewer miles per week Annual savings: $80; 520 pounds CO2 Reduce your garbage by 10% through greater recycling or reduced packaging Annual savings: 1200 pounds CO2 Caulk and weather-strip around doors and windows Annual savings: $80; 650 pounds CO2 * These are mid-range estimates from published sources; your savings may vary.
    13. 13. Our take-home message… Each of us must take steps to protect our Earth's climate.
    14. 14. Thank U