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Which planting method is more helpful in keeping carbon in the soil? Conventional till No till Which data did you use to determine your answer to part b? Annual vs perennial. Which type of crop produces more biomass? Annual Perennial Which data did you use to determine your answer to part a? Which type of crop is more helpful in keeping carbon in the soil? Annual Perennial Which data did you use to determine your answer to part c? Which type of crop is likely to require more energy for planting, tending, and harvesting? Annual Perennial Explain your answer. Cost/benefit analysis. Remember that in order to have biofuels help with the global warming problem, we want to maximize the amount of plant biomass produced and minimize the amount of energy needed to produce it. If you were a congressman thinking about environmental policy, which option would you support? Conventional corn No till corn Switchgrass Prairie grass Explain your answer including which data you used to make your decision. What other data might you need to consider to determine if this is a good choice? Pro/Cons Activity: Identify whether the following sentences are advantages or disadvantages of the different generations of biofuels. Burns cleaner than fossil fuels Can use waste water and can be grown in the ocean Technology still needs improvement to make it competitive with fossil fuels Biomass source are food crops such as corn, potatoes and sugar beet . Produces ethanol, which has a much lower energy density than gasoline Competes with food crops over clean water and arable land Biomass crops can be grown in land unsuitable for food crops . . Is more energy dense per acre of harvest than the other two generations Needs to be treated prior to fermentation to release the 'trapped' sugars Provides only a slight advantage with regards to greenhouse gases due to the high energy input required to produce The process to produce has been known for centuries and is used to make alcohol, yogurt