Lehrman Grocery Bags - Northwestern University study... · friendly) grocery bag to use. In order...
Transcript of Lehrman Grocery Bags - Northwestern University study... · friendly) grocery bag to use. In order...
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Grocery Bags
Jessica Lehrman
Jeremy Li
Lee Sheets
Kent Shirer
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Background & Motivation
� Many different types of grocery bags: � Reusable Cotton
� Reusable Polypropylene
� Paper
� HDPE
� PLA
� Comparison based on bag volume
What is the environmental cost (energy, CO2) of using different types of grocery bags?
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Reusable Cotton Bags
CO2 (kg)
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Reusable Polypropylene (PP) Bags
CO2 (kg)
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Paper Bags
CO2 (kg)
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High Density Polyethylene (HDPE) Bags
CO2 (kg)
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Polylactic Acid (PLA) Bags
CO2 (kg)
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Summary
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In Order to Break Even…
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In Order to Break Even…
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What about Recycling?
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Conclusions
� Polypropylene is the best (most environmentally friendly) grocery bag to use.
� In order to break even (energetically) with disposable grocery bags, polypropylene bags need to be used 5 – 10 times. � If not reused, cotton and polypropylene bags are even worse than disposable bags.
� It’s easy to make a huge impact on the environment on a daily basis!
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Questions?