Comment by dismalaf

No, because most of the estimates are wonky as hell. For one, calories from silage don't exactly translate directly to calories humans can make use of. Second, most estimates are worst case only and ignore the fact most animals are pastured for some/all of the year on marginal land. Some animals can survive entirely on foraging and waste from agriculture (pigs are a great example).

On the other side, not all climates can produce all the plants required for a balanced vegan diet. Here in Canada, nothing grows for 6 months and what does grow is relatively limited.

The lowest energy system would likely include a reduction in animal products but not a complete elimination, while keeping transportation to a minimum.

Also, just like with energy generation, there's the game theory aspect. If you reduce emissions, will everyone cooperate? What if you suffer only to have someone else increase their emissions anyway? We see this here... We limit our fisheries to try preserve ocean fish, only for Chinese vessels to sit on the edge of our borders hoovering up all the aquatic life...