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I’m talking about that the society as a whole will produce less food if we all would go vegan.

It would be a big change for sure, but maybe less of a problem than you imagine:

https://ourworldindata.org/grapher/share-of-calories-from-an...

Also there's the fact that, per calorie, producing beef requires an order of magnitude more arable land than producing <insert-your-favorite-vegetable-here>, since cattle eat so much more than humans do.

See my reply here https://news.ycombinator.com/item?id=24514430

Only a small percentage of US beef production is grass fed and worldwide grazing systems supply about 9 percent of the world's production of beef, the rest are crop fed in addition!

https://news.cornell.edu/stories/1997/08/us-could-feed-800-m...

https://iopscience.iop.org/article/10.1088/1748-9326/aad401

See my reply https://news.ycombinator.com/item?id=24517049

So you _do_ actually support the cessation of a large majority of meat production?

Reply on news.ycombinator.com