POGIL Photosynthesis and Respiration.docx

17 are any of your answers from question 16 due to

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17. Are any of your answers from Question 16 due to human activity? Explain. 18. Ignoring the human actions of auto and factory emissions, what generalization can you make about the balance of carbon dioxide in Model 2 over a long period of time? 19. How would the burning of fossil fuels upset the balance of the carbon dioxide cycle? 20. Deforestation is another example of human activities that affects the carbon dioxide cycle. Explain how the cutting down and burning of trees would affect this cycle.
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Extension Questions 21. Ethanol is one example of alternative fuels for powering our cars and trucks. Ethanol can be produced in different ways, but most often by microorganisms acting on plant materials such as corn. Advocates argue that burning ethanol would not alter the net emission of CO 2 even though when ethanol is involved in combustion it produces CO 2 . What are the pros and cons of producing and burning ethanol? 22. Electricity consumption is a huge producer of atmospheric carbon dioxide because much of the USA’s electricity is produced in coal burning power plants. What are three other ways that elec- tricity can be produced that would NOT increase atmospheric carbon dioxide? Which of these does your group think holds the most promise for the future?
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