Literally all beef in Canada and the US is grazed on open pastures. The majority of it is sent to feed lots for the last couple of months of their life to be fattened on grain, but they spend the first year in pasture no matter what. Second, absolutely none of the feed is imported from South America. It is from Nebraska and Iowa in the US, and Alberta and Saskatchewan in Canada. Both nations produce massive amounts of grain, far more than needed to feed all the livestock we raise, much less just the cattle. Third, this is the point, it isn't attempting to minimize deforestation. My eating beef or not eating beef does absolutely nothing, as my beef did not cause any deforestation. My habits do not cause people half way around the world to change their behavior.

And just as a note of interest, your first link is quite incorrect. It uses the lowest production pasture figure for its math rather than the average, it does not consider the idea that grass fed beef becoming a major industry might involve people switching to more productive grazing systems which we know produce at least double the calories per acre. It ignores the huge quantity of idle grassland we currently have which could be used for cattle production. And it neglects to factor in the millions of acres of corn and soy fields that would no longer be needed for cattle feed and can be converted to pasture.

https://bovinepracticum.blogspot.com/2018/03/another-land-us...