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
My post describes a model for thinking about when it makes sense to be vegan, and how I apply it in my case. My specific numbers are much less useful to other people, and I'm not claiming that I've found the one true best estimate. Ways the post can be useful include (a) discussion over whether this is a good model to be using and (b) discussion over how people think about these sort of relative numbers.
I included the "I think there's a very large chance they don't matter at all, and that there's just no one inside to suffer" out of transparency. ( https://www.facebook.com/jefftk/posts/10100153860544072?comment_id=10100153864306532 ) The post doesn't depend on it at all, and everything is conditional on animals mattering.
You're right that the post doesn't argue for my specific numbers on comparing animals and humans: they're inputs to the model. On the other hand, I do think that if we surveyed the general population on how they would make tradeoffs between human life and animal suffering these would be within the typical range, and these aren't numbers I've chosen to get a specific outcome.
I phrased these as "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?" As in, if you gave me a choice between the two, which do I prefer. This seems pretty carefully specified to me, and clear enough that someone else could give their own numbers and we could figure out where our largest differences are?
This kind of argument has issues with demandingness. Here's a parallel argument: renting a 1br apartment for yourself instead of splitting a 2br with someone kills ~6 people a year because you could be donating the difference. (Figuring a 1br costs $2k/m and a 2br costs $3k/m. This gives a delta of $11k, and GiveWell gives a best guess of ~$1700 for "Cost per outcome as good as averting the death of an individual under 5 — AMF"). Is that a worthwhile thing to cause?
In general, I think the model EAs should be using for thinking about giving things up is to figure out how much sacrifice we're willing to make, and then figure out for that level of sacrifice what options do the most good. Simply saying "X has harm and so we should not do it" turns into "if there's anything that you don't absolutely need, or anything you consume where there's a slightly less harmful version, you must stop".