A worldwide temperature alteration - PowerPoint PPT Presentation

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A worldwide temperature alteration

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  1. Global Warming

  2. What is global warming? "Global warming" refers to the rise in the Earth's temperature resulting from an increase in heat-trapping gases in the atmosphere.

  3. What is causing global warming? • The Greenhouse Effect: addition of large amounts of heat-trapping gases, such as CO2 to the atmosphere due to burning of fossil fuels • Deforestation: mainly in the tropics, and other land-use changes.

  4. Is global warming already happening? • Yes. The IPCC concluded in its Third Assessment Report, "An increasing body of observations gives a collective picture of a warming world and other changes in the climate system."

  5. Examples of observed climatic changes • Increase in global average surface temperature of about 1°F in the 20th century • Decrease of snow cover and sea ice extent and the retreat of mountain glaciers in the latter half of the 20th century

  6. Observed Sea Ice 1979 vs. 2003

  7. Examples of observed climatic changes • Rise in global average sea level and the increase in ocean water temperatures • Likely increase in average precipitation over the middle and high latitudes of the Northern Hemisphere, and over tropical land areas • Increase in the frequency of extreme precipitation events in some regions of the world

  8. Examples of observed physical and ecological changes • Thawing of permafrost • Lengthening of the growing season in middle and high latitudes • Poleward and upward shift of plant and animal ranges • Decline of some plant and animal species

  9. Examples of observed physical and ecological changes • Earlier flowering of trees • Earlier emergence of insects • Earlier egg-laying in birds

  10. Is there anything we can do about global warming? Yes! The most important action we can take to slow global warming is to reduce emissions of heat-trapping gases.

  11. What can the government do to reduce greenhouse gases? • Increasing energy efficiency standards • Encouraging the use of renewable energy sources (such as wind and solar power) • Eliminating subsidies that encourage the use of coal and oil by making them artificially cheap • Protecting and restoring forests, which serve as important storehouses of carbon

  12. What can individuals do to reduce greenhouse gases? • Driving less and driving more fuel-efficient and less-polluting cars • Using energy-efficient appliances • Insulating homes • Using less electricity in general