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What is an appropriate functional unit for the following comparative life cycle assessments (LCAs) and why? [10 points] a. Electricity from wind power vs. electricity

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What is an appropriate functional unit for the following comparative life cycle assessments (LCAs) and why? [10 points] a. Electricity from wind power vs. electricity from a natural gas power plant b. Delivering nonperishable groceries by small delivery truck from Amazon vs. delivering groceries by Instacart shopper and their personal vehicle from a neighborhood grocery store c. Watching a movie on DVD vs. watching a movie streaming on Netflix d. Glasses vs. contact lenses e. Asphalt shingle roof vs. clay tile roof

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