A newly produced UN Report rightly points out, among other things, that the western model of meat and dairy production simply won't work on a planet of 9 billion people. The report, which quantifies the basic unsustainability of affluent societies and the challenges facing us in satisfying needs we've spent a century creating and can't possibly actually fulfill, is generally a good one. But I do want to take issue with the underlying assumptions in the report, including the ones that lead the UN to the most controversial and media-attention gathering claim - that we need to move towards a…