CE11 HW4 - Eddie Lo 19483002 CE 11 HW 4 1. Rubin 7.9 A)...

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Eddie Lo 19483002 CE 11 HW 4 1. Rubin 7.9 A) Different amounts of paper and plastic bags are compared possibly to make the final results the input and output readouts more comparable and on a more similar scale. To sample fewer plastic bags would presumably lower both the energy and air pollution emission numbers, which may skew data that would make the two types of bags incomparable. By doubling the amount of plastic bags sampled, the energy and air pollution emissions metrics are on the same order of the paper bag numbers, thereby allowing for more reasonable comparisons and conclusions. Another reason that it is not 1:1 may have to do with the weight and strength of a paper versus a plastic bag, because it takes 2 plastic bags to make up the same strength as a paper bag; thus requiring 2 plastic bags to equate to a comparable 1 paper. B) From the table provided, it is clear that the energy to make plastic bags is significantly less than making paper bags – even when comparing twice the production of plastic over paper, the energy required is lower across the board. Thus, we can conclude that energy effects are lower for making plastic bags when comparing the making of plastic versus paper bags. C) From the table provided, with the exception of the Ciamborne study, the amount of air pollution emissions is lower for plastic bags than paper bags. However, because all studies compare twice the production of plastic bags as compared to paper, to produce the same amount of paper bags would put the published air pollution emission numbers much higher; this is to say that the air pollution of effects of making plastic bags has a smaller environmental impact than making the same amount of paper bags. D) Three factors that might be responsible for differences in the data among these studies may include:
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This note was uploaded on 05/08/2011 for the course CE 11 taught by Professor Horvath during the Spring '11 term at University of California, Berkeley.

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CE11 HW4 - Eddie Lo 19483002 CE 11 HW 4 1. Rubin 7.9 A)...

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