'Tis honor among us thieves, though, Petey, me boy!
Yes, JonR, plastic is made from petroleum. Ironically, my father, who spent his working career as a petroleum engineer for an oil company, is appalled by the proliferation of throwaway plastic packaging. He considers it a terrible waste of a precious resource by our convenience-oriented society. He almost always asks for paper bags.
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If it ain't broke, mess with it anyway!