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Yes, it is a by-product of food consumption. So there is no waste.

Its very sustainable, in that regards. [1]

Edit: citation added.

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[1] "Some 70 percent of the world's supply comes from China, typically from birds killed for their meat. Most of the rest comes from Europe and Canada, from birds harvested for meat or pâté.", http://en.wikipedia.org/wiki/Down_feather#cite_note-24




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