> But what do we need the land for

We should reforest most of that land. It was previously mostly forested anyway, and doing so, together with a rapid phase-out of fossil fuels, would enable us to store enough carbon to halt global warming, restore biodiversity, and repair the water cycle to prevent droughts.

https://ourworldindata.org/deforestation#the-world-has-lost-...

> grazing animals are beneficial for the land

Not really.

https://www.oxfordmartin.ox.ac.uk/publications/grazed-and-co...

https://newrepublic.com/article/163735/myth-regenerative-ran...

https://grist.org/climate-energy/cattle-grazing-is-a-climate...