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.
Comment via: facebook
I think this is a very interesting point which I hadn't thought of before. To add to it, let's assume the "how much animals matter" values from the original post were chosen in a way more favorable to animals such that veganism seems to make economic moral sense, so we come to the conclusion "it's probably an effective intervention for an EA to go vegan".
Now assume some charity finds a super-effective intervention that cuts the cost of saving a human life to 10% its previous best value. Following the original argument, that would basically mean at this point going vegan is not recommended anymore because it may now be much less effective than the one thing we're semi-arbitrarily comparing it to.
It seems rather counter-intuitive that thousands of hypothetical rational EAs would now start eating meat again, simply because a charity found a cheaper way to save humans.
But then again, I can't get rid of the feeling that this whole counter-argument too is arbitrary and constructed, and that it wouldn't convince me if I were of the opposite opinion, but rather seem like a kind of logic puzzle where you have to find the error of thought. Maybe despite being counter-intuitive, the absurd sounding conclusion would still be the correct one in some sense.