Global Warming and Greenhouse Gases
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Questions and Answers

What are some of the negative consequences of global warming mentioned in the text?

  • Rising sea levels and melting of polar ice (correct)
  • Drop in global average temperatures
  • Increase in atmospheric oxygen levels
  • Expansion of forest cover
  • Which of the following gases, besides carbon dioxide and water vapor, is mentioned as a greenhouse gas in the text?

  • Helium (He)
  • Methane (CH4) (correct)
  • Oxygen (O2)
  • Hydrogen (H2)
  • What term is used in the text to collectively refer to gases like methane and nitrous oxide?

  • Trace gases (correct)
  • Primary gases
  • Mainstream gases
  • Common gases
  • What has been the trend in methane levels over the past century as mentioned in the text?

    <p>Increasing</p> Signup and view all the answers

    Where do high readings of CO2 occur according to the text?

    <p>Winter when plants die and release CO2</p> Signup and view all the answers

    Why is methane increasing rapidly as mentioned in the text?

    <p>Currently under study</p> Signup and view all the answers

    What is the main source of CO2 measurements mentioned in the text?

    <p>Ice cores in Greenland and Antarctica</p> Signup and view all the answers

    What was the average CO2 level before the industrial revolution according to ice core data?

    <p>280 parts per million (ppm)</p> Signup and view all the answers

    How much has CO2 levels increased since the early 1800s?

    <p>37 percent</p> Signup and view all the answers

    Which gas traps a portion of the earth's outgoing energy alongside water vapor?

    <p>Carbon dioxide</p> Signup and view all the answers

    How much is CO2 presently increasing annually?

    <p>0.4 percent</p> Signup and view all the answers

    What could be the potential rise in the earth's surface temperature by the end of this century if CO2 levels continue to increase at present rates?

    <p>3°C</p> Signup and view all the answers

    Which concept includes the accumulation of daily and seasonal weather events over a long period of time?

    <p>Climate</p> Signup and view all the answers

    What phenomenon helps distinguish among climates with similar weather averages?

    <p>Frequency of extreme weather events</p> Signup and view all the answers

    What can be observed cyclically advancing and retreating over an interval of 2 million years according to the text?

    <p>Ice sheets and glaciers</p> Signup and view all the answers

    What would need to happen for glaciers to extend as far south as Kansas and Illinois, according to the text?

    <p>Average temperature decrease and rise cyclically</p> Signup and view all the answers

    What factor is crucial for the advancement and retreat of glaciers over time as described in the text?

    <p>Cyclic changes in average temperature</p> Signup and view all the answers

    In the context of the text, what would likely cause a cyclic change in the average temperature of North America?

    <p>Natural climate processes</p> Signup and view all the answers

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