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With a traditional grazing system he's right. You don't need any fertilizers, cows will just eat grass. Of course you can't feed billions of people with it nor you will be able to eat meat every day.

But even if you are carbon neutral over time, the methane released will still have a negative effect as it trap more energy than CO2.

https://www.nzagrc.org.nz/faq-1,listing,464,how-do-livestock...

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Most European cattle are grass fed, it's nothing to do with the amount of people you can feed with it. US and Canadian cattle are grain fed because the US grows huge amounts of subsidised grain and it's cheap. It really is that simple.

Some studies claim you get a sixth of the methane from grass fed cows.

Even USA herds mostly feed on grass or hay. Animals only go to the feedlots for a few months before slaughter. They do add a lot of mass in that period. Anyway, beef consumers can certainly vote on this topic. If you prefer the taste or morality of grass-fed beef, it's available for purchase.

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