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only a self-conscious being can have preferences for the future

I think there is a different distinction between self-conscious and time-conscious beings. i.e. dogs who can see their reflection but don't process more than about an hour of time into the past.

I don't know how you want to factor that into your considerations.

1. Meat requires us to kill animals.
2. Factory farmed animals are in a considerable amount of pain for most of their life.
3. Meat productions requires much more space than producing plants, and therefore might contribute to the world hunger
4. Some Studies claim that meat, especially if factory farmed, is unhealthy.
5. Meat production is bad for the environment (partly because of point 4, but also for other reasons)

I would challenge 2 on the idea that factory farming doesn't inherently Try to cause pain. In fact it's usually common knowledge that animals in pain don't usually produce good meat. (without going deep into this because it's a contentious topic)

I would challenge 3 on the idea that in Australia (and probably in other parts of the world) we have a lot of semi-arable land. which is not appropriate for food crops, but can be used for paddock cattle. also similarly high up and mountaneous rocky regions can be good fodder for goats but not viable for large-scale crops for other reasons (i.e. weather conditions). By all means; feed the world. but you can't do it by trying to use non-fertile land for the solution to growing more food.

4 is usually about it being less healthy than other meat.

and as said by others 1: vat meat would be a win-for-all.