Of the total area that is used by humans (Agriculture, Urban and Built-up Land),
- urban and built-up land is 1m km²,
- agriculture is 48m km²,
so agriculture is 48 of 49 millions km² used, that’s 98%. The remaining 2% are all streets and housing and other infrastructure together.
It’s not only pastures. Growing animal feed is vastly less efficient than growing food for humans directly. We could stop farming animals, use some of that land for growing human food, rewild the excess, and rewild the pastures.