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Objectives Review Vocabulary Explain the greenhouse effect.
Section 14.4 Impact of Human Activities Objectives Explain the greenhouse effect. Describe global warming. Describe how humans impact climate. Review Vocabulary radiation: transfer of thermal energy by electromagnetic waves
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Section 14.4 Impact of Human Activities Over time, human activities can alter atmospheric conditions enough to influence changes in weather and climate. New Vocabulary greenhouse effect global warming
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Influence on the Atmosphere
Section 14.4 Impact of Human Activities Influence on the Atmosphere 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.
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Influence on the Atmosphere
Section 14.4 Impact of Human Activities Influence on the Atmosphere 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.
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Impact of Human Activities
Section 14.4 Impact of Human Activities Please click the image above to view the video.
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Section 14.4 Impact of Human Activities Global Warming 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.
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Global Warming Burning fossil fuels
Section 14.4 Impact of Human Activities Global Warming 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.
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Global Warming Deforestation
Section 14.4 Impact of Human Activities Global Warming 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.
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Global Warming Environmental efforts
Section 14.4 Impact of Human Activities Global Warming Environmental efforts Individuals can reduce the amount of carbon dioxide emitted to the atmosphere by conserving energy, which reduces fossil fuel consumption.
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14 Climate Chapter Resource Menu 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.
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Section 14.4 Impact of Human Activities
Study Guide Key Concepts Section 14.4 Impact of Human Activities 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.
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Section 14.4 Impact of Human Activities
Study Guide Key Concepts Section 14.4 Impact of Human Activities Human activities can influence changes in weather and climate. Individuals can reduce their environmental impact on climate change.
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14 Climate 14.4 Section Questions Which gas is a greenhouse gas that is released when fossil fuels are burned? a. oxygen b. helium c. carbon dioxide d. nitrogen
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14 Climate 14.4 Section Questions 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
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14 Climate 14.4 Section Questions How can people reduce the amounts of greenhouse gases released into the atmosphere?
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14 Climate 14.4 Section Questions 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.
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Chapter Assessment Questions
14 Climate Chapter Assessment Questions Why do many scientists think that increasing levels of greenhouse gases in the atmosphere are contributing to global warming?
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Chapter Assessment Questions
14 Climate Chapter Assessment Questions 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.
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Standardized Test Practice
14 Climate Standardized Test Practice Which twenty-year period has the highest average global temperature? a to 1900 b to 1920 c to 1980 d to 2000
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14 Climate Section 14.4 Vocabulary greenhouse effect global warming
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