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Thinking about carbon dioxide sequestration (and whether polycarbonate is derived from carbon dioxide), I referred to "Carbon Dioxide Capture: Prospects for New Materials" by D. M. D'Alessandro, et al in Angew. Chemie. Int. Ed. 2010, 49, 2-27 (DOI: 10.1002/anie.201000431). I would post it as recommended reading but it's probably behind a pay-wall for many readers. I wondered if we want to take a position on this? Ideally, I will refer only to what is in the public domain. Even in that context, we may need to be aware of what is "fair use" in quoting passages.