Yet another person who has no idea of how their food is produced.

30 month grass fed beef especially on hills where crops cannot be grown is totally sustainable.
The beef is of exceptional quality and fetches a good premium.
It is ecologically sound farming, the shit from the cattle helps fertilizes the ground and sustains insect life and beetles which are in turn food for birds and bats.
It is kind too, the calves often run and suckle with their mothers for 9 months, all the cattle have a happy life grazing outdoors in summer.

Go work on a farm for a year, burning 5000 calories a day and see how you survive on a vegan diet.

Meanwhile stack those Satoshis and you'll have a bright future ahead.