[imw]

It doesn't reflect well on your argument that your quote doesn't appear in the source.

"Results estimate that livestock consume 6 billion tonnes of feed (dry matter) annually – including one third of global cereal production – of which 86% is made of materials that are currently not eaten by humans. In addition, soybean cakes, which production can be considered as main driver or land-use, represent 4% of the global livestock feed intake. Producing 1 kg of boneless meat requires an average of 2.8 kg human-edible feed in ruminant systems and 3.2 kg in monogastric systems. While livestock is estimated to use 2.5 billion ha of land, modest improvements in feed use efficiency can reduce further expansion."

Even the source you are citing agrees that after massaging the numbers as much as possible it's still 3x less efficient to produce calories for human consumption by feeling animals.

[barrell]

I was quoting Diana Rogers, who provided a source for her statements, so I thought I would include it.

I cannot access the full article, but from the abstract that seems to not be congruent with what the study is suggest. Perhaps you are confusing kg for kcal? It could indeed be the fact that it is 3x less efficient by weight.

Given that the article is pointing out that 86% of the feed for animals is not edible by humans, claiming that meat is 3x less efficient calorie wise with these numbers is also making the claim that we are growing plants 2x more calorically dense by meat than weight.