0708 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 first life forms appeared ~3.8 billion years ago  Photosynthesis began 3.5-2.5 billion years ago,  which produced oxygen and removed carbon dioxide and methane, which are greenhouse gases, from the atmosphere  As a result, the Earth went through periods of cooling, commonly referred to as “Snowball Earth” and subsequent warming  Earth began its current cycles of glacial and interglacial periods around 3 million 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. 
  •  If amount of solar energy absorbed by the earth is equal to the amount radiated back into space, the earth remains at a constant temperature. 
  •  However, if the amount of solar energy is greater than the amount radiated, then the earth heats up. 
  •  If the amount of solar energy is less than the amount radiated, then the earth cools down. 
  • To a certain degree, the earth acts like a greenhouse.  Energy from the Sun penetrates the glass of a greenhouse and warms the air and objects within the greenhouse. The same glass slows the heat from escaping, resulting in much higher temperatures within the greenhouse than outside it. 
  • 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. 
  • This spike is due to the exponential increase in the use of fossil fuels over the last 150 years. Shown here are emissions of carbon from  gas,  solid,  liquid fuels, and  the total carbon emissions. 
  • 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. 
  • Future Carbon Emissions  will probably increase, especially in China and developing countries  This will result in a likely doubling of carbon dioxide levels within 150 years, due to  Increased coal usage  And increased natural gas usage,  although petroleum usage is likely to decrease due to increased cost and decreasing supply 
  • 0708 global warming

    1. 1. Making a Difference One Watt at a Time
    2. 2. Introduction • Is the world getting warmer? • If so, are the actions of mankind to blame for earth’s temperature increases? • What can/should be done about these issues?
    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. History of Earth’s Climate • Life appeared ~3.8 billion years ago • Photosynthesis began 3.5-2.5 billion years ago – Produced oxygen and removed carbon dioxide and methane (greenhouse gases) – Earth went through periods of cooling (“Snowball Earth”) and warming • Earth began cycles of glacial and interglacial periods ~3 million years ago
    5. 5. Sun Earth’s Temperature Solar Energy Solar Energy
    6. 6. Sun Earth’s Temperature Solar Energy Radiation Cooling
    7. 7. Sun Earth’s Temperature Solar Energy Radiation Cooling
    8. 8. Sun Earth’s Temperature Solar Energy Radiation Cooling
    9. 9. Greenhouse EffectSun
    10. 10. Earth’s Atmospheric Gases Nitrogen (N2) Oxygen (O2) Water (H2O) Carbon Dioxide (CO2) Methane (CH4) Non- Greenhouse Gases 99% Greenhouse Gases 1%
    11. 11. The U.S. emits about 6.4 billion metric tons of greenhouse gases annually, 25% of the world’s total. Carbon dioxide stays in the atmosphere for approximately 100 years, methane lasts about 12 years. Other greenhouse gases last even longer. As these gases continue to raise surface temperatures, they trigger the release of even greater quantities of carbon dioxide and methane that are currently trapped in frozen Arctic permafrost and tundra soils, further increasing temperatures. …potentially causing “runaway global warming”. 6.4 billion metric tons CO2/yr These greenhouse gases last a long time… Warming begets more warming… A feedback mechanism ensues…
    12. 12. Worldwide Carbon EmissionsCarbon(109 metrictons) 0 1 2 3 4 5 6 7 8 1750 1800 1850 1900 1950 2000 Year Liquid fuel Total Gas fuel Solid fuel
    13. 13. 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)
    14. 14. Future Carbon Dioxide Levels • Increasing CO2 emissions, especially in China and developing countries • Likely to double within 150 years: – Increased coal usage – Increased natural gas usage – Decreased petroleum usage (increased cost and decreasing supply)
    15. 15. Of all U.S. greenhouse gas emissions come from households: • Vehicles • Home Heating • Electricity Households are Big Contributors to Climate Change
    16. 16. So how can each of us slow global warming now?
    17. 17. 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 Mountaintop removal for coal mining near Rawl, West Virginia. 50% of electricity in the United States is produced from coal. (
    18. 18. Average Electricity Emission Factors Region/State CO2lb/kWh CO2tons/MWh CO2Metrictons/MWh CH4lbs/MWh NO2lbs/MWh SouthAtlantic 1.35 0.674 0.612 0.0127 0.0207 NorthCarolina 1.24 0.621 0.563 0.0105 0.0203 Virginia 1.16 0.582 0.528 0.0137 0.0192 WestVirginia 1.98 0.998 0.897 0.0137 0.0316
    19. 19. Kitchen Light Fixture Three 60 Watt Bulbs
    20. 20. How much energy are those bulbs using? 1 2 3 4 5 6 7 Wattage of the bulbs # of bulbs Watts Used (Wattage x number of bulbs) Hours used per day Watts Used (#3) x Total Hours/day (#4) Watts hours / year (#5 x 365 days ) Kilowatt hours / year (1000Wh = 1kWh) (divide #6 by 100 0) (Incandescent bulbs) 60 W 3 bulbs (60 x 3) 180 W 10 hours a day (180 x 10) 1800 Wh/day (1800 x 365) 640,800 Wh/ year (640,800/10 00) 640.8 kWh per year (CFL bulbs) 18 W 3 bulbs 18 x3 54 W 10 hours a day 54 x 10 540 Wh/day 540x365 197,100 Wh/day 197,100 1000 197.1 kWh/yr
    21. 21. Incandescents Compact Fluorescent s (CFL s) Total kWh for 3 bulb (#7 from above) 640.8 kWh Cost (kWh #7 x $.18) CO2 produced @ 1.16 lbs/kWh lbs lbs CO2 not emitted by switching 3 bulbs (C O2 of incandescents - C O2 of CFLs) lbs Money saved in energy (Cost incandescents - cost of CFLs) 3 BULB REPLACEMENT EMISSION and COST COMPARISON INCANDESCENT vs. COMPACT FLUORESCENT 197 kWh $115.34 $35.46 743.3 228.52 514.8 $79.88
    22. 22. 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! If every American household replaced just 5 high-use incandescent bulbs with compact florescent lights we'd collectively save more than $8 billion each year in energy costs and we would prevent the greenhouse gases equivalent to the emissions from nearly 10 million cars. Source: http://www.energystar.gov
    23. 23. 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.
    24. 24. Blowing Up Your World • 1. How many of you leave your bedroom light on when you are not in the room? • Turning off lights saves energy and money. The more energy used, the more rivers are dammed or more fossil fuel is burned, causing air pollution and increased levels of carbon dioxide in the atmosphere. 2 pts d
    25. 25. Blowing Up Your World • How many of you walked, bicycled or took public transportation to get to school today, instead of coming by private automobile? Our reliance on cars that burn fossil fuels is one of the major causes of increased levels of carbon dioxide in the atmosphere and it is the primary cause of urban smog. 3 pts u
    26. 26. Blowing Up Your World • How many of you, when you drink a soft drink, throw the container into the garbage? • Throwing away containers of any kind wastes energy and resources and adds to our waste problem. Many towns are running out of landfill space. 3 pts d
    27. 27. Blowing Up Your World How many of you eat fresh vegetables instead of canned or frozen? Fresh vegetables cook more quickly and are usually more nutritious than frozen or canned foods. Canned and frozen vegetables are often over-processed, contain additives, contribute to air pollution (transport and packaging) and add to our waste problem. 4 pts u Blowing Up Your World
    28. 28. Blowing Up Your World • How many of you use a hairdryer or other energy-consuming convenience appliance, especially in the morning? • Hairdryers use a lot of energy. In the morning so much energy demand is put on our grids that power companies have to find other sources of energy just to meet the morning rush hour 2 pts d
    29. 29. Blowing Up Your World • . How many of you, when you go to a store, get a bag for your purchases, even if you have only one or two small items to carry? • Making paper and plastic bags uses energy and resources. The bags add to our litter and waste problems, and plastic is not biodegradable. Recycling is not the best answer because collecting and recycling materials requires energy. Instead, carry a reusable cloth bag or a knapsack with you. 3 pts d
    30. 30. Blowing Up Your World How many of you carry your lunch to school in a lunch box or reusable container? Making paper and plastic bags uses energy and resources. 3 pts u
    31. 31. Blowing Up Your World • How many of you eat take-out or cafeteria food that is served in foam or plastic containers? • Polystyrene and other plastic containers are made from precious petrochemicals, do not decompose in landfills, and release toxic gases when they are burned in incinerators. 10 pts d
    32. 32. Blowing Up Your World • How many of you use handkerchiefs instead of tissues and use cloth towels instead of paper towels? • Paper comes from trees. The more of it we use, the more trees that are cut down 2 pts d
    33. 33. Blowing Up Your World • How many are changing incandescent bulbs for new compact fluorescent bulbs? Changing one bulb could save 150 pounds of carbon dioxide per year! 10 pts u
    34. 34. Blowing Up Your World • 31 - 40 Very good. You're an environmentalist! • 21 - 30 Good, you're starting to save the world. • 11 - 20 Lots of room for improvement. • 0 - 10 You're exiled to the town dump!
    35. 35. Our take-home message… Each of us must take steps to protect our Earth's climate.