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Lecture 11

ECN510 Notes Lecture 11

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ECN 510

Lecture 11 Global Climate Change and Human Health  Human activities sped up the change in climate; climate changes which occur naturally are acceptable however.  In sections of global temperature graphs over periods of years where cold parts are displayed are called “glaciations” and are very long (100 000 years). On the other hand, the warmer periods were called “interglaciation period” which were relatively brief (10 000 to 20 000 years)  The last ice age was approximately 12 000 years ago. The Earth’s Natural Green-House Effect  Energy from the Sun warms the Earth  Is partly responsible for Earth’s biodiversity  Energy radiates back toward space  Water vapour (clouds), CO 2nd other gases are heated and they then radiate the heat in all directions (either into space or warms the air and the Earth’s surface). Green House Gases  Examples of green house gases are: water vapour, CO 2 CH 4 N 2  Carbon dioxide levels dramatically increased  CH 4methane) increased and is leveling off  Nitric Acid increased significantly but is leveling off Atmospheric CO level and Global Temperature 2  There is a correlation (positive) between carbon dioxide and increased temperatures. Processes Affecting Increase off Green House Gases  Fossil Fuels (releases a lot of carbon dioxide; used a lot) o Electricity Generated By Coal – 42% o Transportation – 24% o Industrial Process –20% o Residential and Commercial Uses – 14%  Clearing and burning forests and grass lands: forests trap carbon dioxide. However, if the forest is cut down, huge amounts of carbon dioxide is released.  Raising large number of livestock (methane)  Planting Rice: a period in which rice in underwater, methane is released  Inorganic Fertilizer: a source of nitric acid Largest Emitter of CO2 1. US – 22.2% 2. China – 18.4% 3. European Union – 11.4% 4. Russia – 5.6% 5. India – 4.9% 6. Japan – 4.6% 7. Germany – 3.0% 8. Canada –2.3% Present Problems th  20 Century was the hottest century in the past 1000 years.  Since 1861, the average global temperature of the troposphere has risen 0.7°C  20 warmest years occurred since 1980  Glaciers and floating sea ice are melting and shrinking  During the last cent
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