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Isn’t most of soya and corn produced used for feeding cattle to produce meat anyway? Is there some comparison on amount of soya needed if everyone on earth goes vegan vs soya consumed by meat industry?

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Soy is pressed for oil. The remaining meal is used almost exclusively for livestock feed. Its not good for much else.

As for corn, it takes 0.8lbs of corn to make 1lb of meat. Its a net gain. The difference comes from grazing of course. And before we talk about "that grazing land could have been used for grain", only 8pct of US grazing land could be converted to cropland.

http://www.beefissuesquarterly.com/beefissuesquarterly.aspx?...

Yes but this article is about grazing livestock, not soya/corn fed livestock.

Then why compare to veganism? The issue then is about sustainable production.

Because it's astroturf.

Not sure if you've read the article. The point he's making is that sustainable farming doesn't share all of the downsides of veganism, soil degradation for instance.

Sustainable Veganism is better than sustainable meat?

Not sure what the question is here. But the article points to veganism on it's own not inherently being the best option. That there are definitely ways to be sustainably vegan, but veganism alone doesn't guarantee sustainability.

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