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Communications Booster: Carbon Cycle and Carbon Reservoirs

Alberto Ramirez, Frederick Community College, Frederick (MD)
Elisabeth Harthcock, San Jacinto College, Pasadena (TX)
Laura Rico-Beck, Museum of Science and Industry, Chicago (IL)

This page builds on teaching materials from the CLEAN reviewed collection along with suggested communications strategies for teaching challenging aspects of climate science.

These materials were created by faculty as part of the CLEAN Climate Communications Workshop, held in April, 2012 and are not yet part of the CLEAN collection of reviewed resources. This activity is part of the community collection of teaching materials on climate and energy topics.


Activity Summary: In order to understand the causes of present-day climate change, students must be familiar with carbon cycle and the trends in atmospheric carbon dioxide. Through this activity, students will use authentic scientific data to construct their own understanding of the atmospheric processes that influence the carbon dioxide record. Additionally to using data, students will acquire a conceptual framework to understand the challenges of climate change.

Activity Description: This is a two-step activity involving the carbon cycle. The first (Carbon Cycle: A Jigsaw Approach) focuses on the intricacies of the organic components of the cycle, and the second (Carbon Cycle Toolkit) focuses on available scientific data and modeling. Both steps emphasize collaboration and critical thinking.

Components of this Activity from the CLEAN Reviewed Collection:

Key Learning Outcomes
For Carbon Cycle: A Jigsaw Approach, students will:For Carbon Cycle Toolkit, students will:
Climate Literacy Context from the Essential Principles of Climate Literacy

Misconceptions and Potential Pitfalls
for Carbon Cycle: A Jigsaw Approach, possible misconceptions include:

These misconceptions try to exempt or justify human activities in the equation, and the activity proposed is geared towards awareness of individual and collective responsibility.

The Carbon Cycle Toolkit is an effective way to address the following 3 misconceptions:
  1. The atmosphere is big and CO2 makes up a small percentage of the total gases, so we are not adding enough carbon dioxide to make a difference. A strategy to address this misconception:
    • Show students the graph to the right.
    • Ask students to make a claims and evidence T-chart and write as many claims as they can based on what they observe in the graph. A claim/evidence pair may be temperature changes and CO2 changes are closely aligned/the blue and red lines in the graph show the same general trends.
    • Introduce the misconception and discuss why the statement is incorrect. Although CO2 is not very abundant in the atmosphere, the fact that it is a greenhouse gas makes it able to trap heat very effectively, and even in small amounts it has large effects on the temperature of the atmosphere.
    • NOTE: introduce the misconception only after students have carried out the claims and evidence chart in order to avoid the familiarity backfire effect.
  2. Burning fossil fuels uses them up, leaving nothing behind. A strategy to address this misconception:
    • Place a piece of paper, cotton ball, or other flammable material in a clear glass beaker.
    • As a class, encourage students to come up with the chemical formula for the material.
    • Write the formula on the board.
    • Light the material on fire and ask students to observe what happens.
    • As a class, brainstorm the products of the reaction and write the complete balanced molecular equation on the board.
    • Explain that combustion is a chemical process that obeys the Law of Conservation of Matter and matter cannot disappear. If we burn something like fossil fuels, the carbon stored in plants and fossilized into coal and oil does not disappear when it burns, but rather it is transformed into the invisible and colorless CO2 and water.
  3. Humans' addition of CO2 to the atmosphere is increasing the total amount of carbon in the environment. This might throw the carbon budget cycle off balance, impacting the carbon cycle. A strategy to address this misconception:
    • Show students the following image, and ask them why it is incomplete:
    • After they identify the processes of the carbon cycle that are missing from the image, show them this image:
    • With these images in mind, introduce them to the misconception and ask them if they can identify why this statement is incorrect. Lead students to the understanding that human activities have the effect of transferring carbon stored in plants and fossil fuels to the atmosphere. The amount of carbon in the atmosphere (and also in the oceans) is increasing, but the total amount of carbon on Earth remains the same.


Potential Pitfalls:

Instructional Strategies

  1. Project-based problem solving as in a Jigsaw Approach.
  2. Assignments to specific roles and tasks to students organized in teams.
  3. Exploration and treasure-hunt activities using Google Earth.
  4. Field activities such as estimating vegetation coverage in your neighborhood, school area or selected park.
  5. Experimental activities using class aquarium, terrarium or simple microorganism culture to measure respiration and CO2 production.
  6. Experimental activities involving the correlation between CO2 solubility and temperature.
  7. Moderated discussions, both face-to-face and online, to follow up on each of the five carbon cycle processes.
  8. The activities are structured around student involvement. The instructor is a lecturer at first but quickly shifts into a facilitator role, ensuring that there is a fundamental understanding of the carbon cycle.
  9. The activities also use an experiential learning strategy as students gather and analyze data, diagram and summarize results, and evaluate and explain their conclusions.

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