What do you think the buffalo live on genius ?

Lots of grazing land isn’t suitable for farming,

Yeah no. Meat animals can only be raised on land which can grow crops.

The grazing land in Africa and the middle east is principally used for textiles like wool and cashmere.

High elevation land in the Himalayas and South America is unusable. Also land in the arctic zone in Europe and North America.

Deserts are not actually barren.