While many people in the effective altruism movement are vegan, I'm not, and I wanted to write some about why. The short answer is what while I'm on board with the general idea of making sacrifices to help others I think veganism doesn't represent a very good tradeoff, and I think we should put our altruistic efforts elsewhere.
There are many reasons people decide to eat vegan food, from ethics to taste to health, and I'm just interested in the ethical perspective. As a consequentialist, the way I see this is, how would the world be different if I stopped eating animals and animal products?
One factor is that I wouldn't be buying animal products anymore, which would reduce the demand for animals, and correspondingly the amount supplied. Elasticity means that if I decrease by buying by one unit I expect production to fall by less than one unit, but I'm going to ignore that here to be on the safe side. Peter Hurford gives a very rough set of numbers for how many continuously living animals are required to support a standard American diet and gets:
- 1/8 of a cow
- 1/8 of a pig
- 3 chickens
- 3 fish
Now, I don't think animals matter as much as humans. I think there's a very large chance they don't matter at all, and that there's just no one inside to suffer, but to be safe I'll assume they do. If animals do matter, I think they still matter substantially less than humans, so if we're going to compare our altruistic options we need a rough exchange rate between animal and human experience. Conditional on animals mattering, averting how many animal-years on a factory farm do I see as being about as good as giving a human another year of life?
- Pigs: about 100. Conditions for pigs are very bad, though I still think humans matter a lot more.
- Chickens: about 1,000. They probably matter much less than pigs.
- Cows: about 10,000. They probably matter about the same as pigs, but their conditions are far better.
- Fish: about 100,000. They matter much less than chickens.
Overall this has, to my own personal best guess, giving a person another year of life being more valuable than at least 230 Americans going vegan for a year.
The last time I wrote about this I used $100 as how much it costs to give someone an extra year of life through a donation to GiveWell's top charities, and while I haven't looked into it again that still seems about right. I think it's likely that you can do much better than this through donations aimed at reducing the risk of human extinction, but is a good figure for comparison. This means I'd rather see someone donate $43 to GiveWell's top charities than see 100 people go vegan for a year.
Since I get much more than $0.43 of enjoyment out of a year's worth of eating animal products, veganism looks like a really bad altruistic tradeoff to me.
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i agree with some other comments, just sharing some thoughts that haven't been posted here yet.
i think that, purely consequentially, you can say that you personally do more good by continuing to purchase products derived from animal suffering (or continuing to do any other deontologically bad thing to others), because doing so makes you happier, or is more convenient, and this lets you be more effective - and that might really be true. to that extent, this isn't even an objection.
that said, when i consider situations involving the use of animal products, i tend to imagine what i would prefer, and how i would feel -- if i were still me, with my current values and mind -- but the roles were swapped; if it was me in a factory farm, and some alien altruist in the equivelant position to the one i am in, in an alien civilization similar to humans'. i ask myself, would i be okay with them doing <whatever> with <thing derived from my suffering>?
and sometimes the answer is yes. if they're cold at night and they're in a situation where the only blanket is made of material derived from my suffering (analogy to wool), and they're feeling conflicted, then okay, they can use it. they're on my side.
if the request was, "can i eat your flesh because i think i derive personal enjoyment from it and i think that lets me be more effective, given i don't feel particularly disturbed by this situation?" then i would (metaphorically) conclude that i am in hell. that this is the altruist angel who is supposedly going to save us. that this is their moral character.[1]
again, this is not an objection per se - it's separate from whether the consequential argument is true, and if it is i guess i prefer you to follow it - it's just some related thoughts about the moral status of the world in which it is true. i am not saying you are wrong, but that if you are not wrong it is wrong for the world to be this way.
to be clear, i'm not saying you are evil and i don't want you to feel bad from reading this.