A common quandary for the environmentally conscious shopper is about the type of bag that should be

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A common quandary for the environmentally conscious shopper is about the type of bag that should be used to carry groceries. Identify the process network to approximate the life cycles of grocery sacks made of 

(a) Paper 

(b) Polyethylene. 

Suggest a functional unit to compare the life cycle impact of the two types of sacks. 

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