The Carbon Cycle and Net Zero Quiz
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Questions and Answers

What is the main observation about the 'Keeling curve' mentioned in the text?

  • The curve shows a fluctuating pattern in atmospheric CO2 concentrations (correct)
  • The curve indicates a significant decrease in the annual cycle of CO2 concentrations
  • The curve shows a steady decrease in atmospheric CO2 concentrations over time
  • The curve demonstrates that CO2 levels have remained constant since the steam engine was invented

    • How much has the atmospheric CO2 concentration increased from when Charles David Keeling started his observations to today?

  • Around 315 parts per million (correct)
  • Around 200 parts per million
  • Around 105 parts per million
  • Around 100 parts per million

    • What is the significance of the annual cycle in CO2 concentrations mentioned in the text?

  • The annual cycle in CO2 concentrations is comparable to about 5 years’ worth of human-induced increase (correct)
  • The annual cycle in CO2 concentrations is specific to Hawaii and not observed in other parts of the world
  • The annual cycle in CO2 concentrations has no impact on overall atmospheric CO2 levels
  • The annual cycle in CO2 concentrations has been steadily decreasing over time

    • What is the conclusion drawn about CO2 as a pollutant in the text?

    <p>CO2 is not quite as simple a pollutant as CFCs</p> Signup and view all the answers

    What does the increase in the rate of pouring carbon dioxide into the atmosphere indicate?

    <p>The rate of pouring carbon dioxide into the atmosphere has increased and is still increasing year on year</p> Signup and view all the answers

    How much has the atmospheric CO2 concentration increased since the start of Charles David Keeling's observations?

    <p>By 315 parts per million</p> Signup and view all the answers

    What is the significance of the 'Keeling curve' mentioned in the text?

    <p>It demonstrates a significant acceleration in CO2 levels over time</p> Signup and view all the answers

    What does the size of the annual cycle in CO2 concentrations in Hawaii suggest?

    <p>It suggests complexities in understanding the natural carbon cycle</p> Signup and view all the answers

    Based on the text, why is carbon dioxide considered a more complex pollutant than CFCs?

    <p>CFCs have natural sources while carbon dioxide does not</p> Signup and view all the answers

    What does the comparison of human-induced increase with the annual cycle in CO2 concentrations suggest about CO2?

    <p>CO2 is not as simple a pollutant as CFCs</p> Signup and view all the answers

    What is the significance of the annual cycle in CO2 concentrations mentioned in the text?

    <p>It indicates a natural balancing mechanism that offsets some human-induced increase in CO2</p> Signup and view all the answers

    Why is carbon dioxide considered a more complex pollutant than CFCs based on the text?

    <p>The natural carbon cycle complicates the removal of CO2 from the atmosphere</p> Signup and view all the answers

    What does the comparison of human-induced increase with the annual cycle in CO2 concentrations suggest about CO2?

    <p>Human-induced increase in CO2 is negligible compared to the natural annual cycle</p> Signup and view all the answers

    What does the size of the annual cycle in CO2 concentrations in Hawaii suggest?

    <p>It highlights the variability of natural processes that affect CO2 levels in Hawaii</p> Signup and view all the answers

    What is the main observation about the 'Keeling curve' mentioned in the text?

    <p>The 'Keeling curve' illustrates a steady increase in atmospheric CO2 concentrations over time</p> Signup and view all the answers

    Study Notes

    The Keeling Curve

    • The main observation about the 'Keeling curve' is that it shows a steady increase in atmospheric CO2 concentrations since Charles David Keeling started his observations.
    • The atmospheric CO2 concentration has increased by about 100 parts per million (ppm) from when Charles David Keeling started his observations to today.

    Annual Cycle in CO2 Concentrations

    • The annual cycle in CO2 concentrations is significant because it shows a natural fluctuation in CO2 levels due to seasonal changes in plant growth and decay.
    • The size of the annual cycle in CO2 concentrations in Hawaii suggests that natural processes can cause significant changes in CO2 levels.

    CO2 as a Pollutant

    • The conclusion drawn about CO2 as a pollutant is that it is more complex than CFCs because its effects are not limited to the ozone layer, but also contribute to global warming.
    • The increase in the rate of pouring carbon dioxide into the atmosphere indicates that human activities are increasingly contributing to the rising CO2 levels.

    Comparison with Natural Cycles

    • The comparison of human-induced increase with the annual cycle in CO2 concentrations suggests that human activities are causing a significant and persistent increase in CO2 levels, beyond natural fluctuations.

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    Description

    Test your knowledge about the carbon cycle and the concept of achieving net zero emissions. This quiz covers topics such as atmospheric CO2 concentrations, the 'Keeling curve', and the impacts of increased CO2 levels on the environment.

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