1) This week, we explored two main ways that plants can "sequester" carbon (remove from the air). One is biological and one is physical (a combination of chemistry and geology). Briefly describe these two mechanisms. 2) There are many "sources" and "sinks" for carbon. List two of each and explain how they act as sources or sinks. 3) Commercial fertilizers contain three main nutrients represented by the three numbers you will find on any of these types of products. Describe what these three numbers represent and the basic role that each plays in plant nutrition. 4) In the case study that you were introduced to this week, an experiment was described where iron would be used to fertilize the ocean. What role does iron play in plant nutrition? Why is the focus on iron and not on other plant nutrients? 5) Beginning with iron, explain how the iron fertilization experiment may work to remove carbon from the atmosphere. Where does the carbon end up?

Views: 5,387 students