alt Hacker News> Yeah agriculture is bad for the environment, but at least it feeds us to keep us alive
This is true, but don't forget a _lot_ of agriculture feeds _animals_ that we in turn eat. If you want to make optimal use of land for human needs, most modern agriculture is not that.
The problem is feed lots.
There's no problem the more conventional practice of letting animals graze the majority of the year. If we didn't use those fields to feed and eat the animals, the grass would turn into CO2 and methane anyway. Or turn into boring forests.
Not everything has to be optimal. That thinking leads to Thanos' snap. People generally enjoy meat. They also enjoy the landscape farmers created.