The last Open Thread was in October 2017, so I thought we were overdue for a new one.
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My comment was concerned with the impact of food waste on the number of animals suffering on factory farms. The report you cite seems to be discussing feed that is 'wasted' in the conversion process. But since this feed is likely to be mostly plants, improving the conversion ratio would probably not have a large effect on the number of animals on factory farms. (If anything, improving the conversion ratio might increase the number of factory farmed animals by reducing how much it costs to raise animals.)