1 / 20

Objectives

Explain the greenhouse effect. Describe global warming. Describe how humans impact climate. Section 14.4. Objectives. Impact of Human Activities. Review Vocabulary. radiation: transfer of thermal energy by electromagnetic waves. Section 14.4. New Vocabulary.

hudak
Télécharger la présentation

Objectives

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Explain the greenhouse effect. Describe global warming. Describe how humans impact climate. Section 14.4 Objectives Impact of Human Activities Review Vocabulary radiation: transfer of thermal energy by electromagnetic waves

  2. Section 14.4 New Vocabulary Impact of Human Activities Over time, human activities can alter atmospheric conditions enough to influence changes in weather and climate. greenhouse effect global warming

  3. Section 14.4 Influence on the Atmosphere Impact of Human Activities The greenhouse effect The process of absorption and radiation of energy in the atmosphere results in the greenhouse effect—the natural heating of Earth’s surface caused by certain atmospheric gases called greenhouse gases.

  4. Section 14.4 Influence on the Atmosphere Impact of Human Activities The greenhouse effect An increase in the amount of atmospheric greenhouse gases, particularly carbon dioxide and methane, would theoretically result in increased absorption of energy in the atmosphere. This can lead to a rise in global temperatures, known as global warming.

  5. Section 14.4 Impact of Human Activities Please click the image above to view the video.

  6. Section 14.4 Global Warming Impact of Human Activities Temperatures worldwide have shown an upward trend over the past 200 years, with several of the warmest years on record having occurred within the last two decades.

  7. Section 14.4 Global Warming Impact of Human Activities Burning fossil fuels One of the main sources of atmospheric carbon dioxide from humans is from the burning of fossil fuels including coal, oil, and natural gas. Burning fossil fuels also releases other greenhouse gases, such as methane and nitrous oxide, into the atmosphere.

  8. Section 14.4 Global Warming Impact of Human Activities Deforestation Deforestation—the mass removal of trees—also plays a role in increasing levels of atmospheric carbon dioxide. When trees are cut down, photosynthesis is reduced, and more carbon dioxide remains in the atmosphere.

  9. Section 14.4 Global Warming Impact of Human Activities Environmental efforts Individuals can reduce the amount of carbon dioxide emitted to the atmosphere by conserving energy, which reduces fossil fuel consumption.

  10. 14 Chapter Resource Menu Climate Study Guide Section Questions Chapter Assessment Questions Standardized Test Practice Earth Science Online Glencoe Earth Science Transparencies Image Bank Vocabulary Animations Click on a hyperlink to view the corresponding feature.

  11. 14 Section 14.4 Impact of Human Activities Study Guide Key Concepts Over time, human activities can alter atmospheric conditions enough to influence changes in weather and climate. • The greenhouse effect influences Earth’s climate. • Worldwide temperatures have shown an upward trend over the past 200 years.

  12. 14 Section 14.4 Impact of Human Activities Study Guide Key Concepts • Human activities can influence changes in weather and climate. • Individuals can reduce their environmental impact on climate change.

  13. 14 14.4 Section Questions Climate Which gas is a greenhouse gas that is released when fossil fuels are burned? a.oxygen b.helium c.carbon dioxide d.nitrogen

  14. 14 14.4 Section Questions Climate Which type of electromagnetic radiation is partly captured and reradiated by greenhouse gases in the atmosphere? a.visible light b.ultraviolet radiation c.infrared radiation d.gamma rays

  15. 14 14.4 Section Questions Climate How can people reduce the amounts of greenhouse gases released into the atmosphere?

  16. 14 14.4 Section Questions Climate Possible answer: One way to reduce the amounts of greenhouse gases is to conserve. If less energy from fossil fuels is used, less greenhouse gas will be released. A second way is to sequester, or capture and store, greenhouse gases. This method may be used more in the future than it is today. A third way is to increase the use of energy sources that do not release greenhouse gases.

  17. 14 Chapter Assessment Questions Climate Why do many scientists think that increasing levels of greenhouse gases in the atmosphere are contributing to global warming?

  18. 14 Chapter Assessment Questions Climate Answer: Earth receives solar energy from the Sun and then reradiates much of the energy as infrared radiation. Greenhouse gases in the atmosphere capture certain wavelengths of this radiation and then reradiate the heat energy back toward Earth. Increasing amounts of greenhouse gases result in increasing amounts of heat being held by the atmosphere.

  19. 14 Standardized Test Practice Climate Which twenty-year period has the highest average global temperature? a.1880 to 1900 b. 1900 to 1920 c.1960 to 1980 d.1980 to 2000

  20. 14 Section 14.4 Vocabulary Climate greenhouse effect global warming

More Related