I came across this video which shows the negative externalities on both the production and consumption side of plastic. It also reinforces the difficulties of putting monetary values on externalities. The first half is better for Economics, the second half drifts into sociological comment.
The above video is supported by this great site on plastic bag usage. In addition, this article considers plant based plastics as a way forward, it is a good example of weighing up costs and benefits – the second-to-last paragraph has some good stuff from a business point of view.
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