It is very dependent on geography. The discussion regarding beef/cattle/meat always takes some "global-scale-scope" which is useless since the topology, soil, water etc. is something that almost exclusively determines what is suitable to grow.
You could not, how much you wanted convert the gracing pastures in Sweden to any high-yield farm.
But sure, keep on looking at a picture of grass and decide that the land is suitable for other crops.
The next time you leave for the wilderness, go to a field, go the edge of it and see if you can figure out if there was a reason they didn't expand it further out.
I wouldn't dream of asking you of taking a random commenter at face value.
(Whether they should be exploited is a different story.)
Meh.
You make an argument that has no practical value. And you make it in a way that is offensive.
Yes, if we had slave labor like the 3rd world then we could farm all the mountains.
This is completely wrong. You can grow regular crops there but usually the land is sloped, the terrain itself is inaccessible or inconvenient for machinery. There are plenty of Asian countries that do terraced rice farming but this requires massive amounts of manual labor compared to a nice, level and flat piece of land on which tractors and combines can drive on.