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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This article seems to have good SEO for keywords involving "effective altruism" and "veganism", which I find unfortunate. I appreciate the author's effort to quantify such a complex topic, and I think it's a very important conversation to have. There are already very good arguments against the article's conclusions in the comments, purely based on ethical grounds. But I'll add an important argument that seems to be missing in the conversation: the author's conclusions are short-termist.
The author's main point is that there is a cost in the transition to veganism, and that cost should be better spent on saving human lives now. My counter-argument is: transitioning to veganism now saves more human lives in the long term (as well as animal lives, of course).
The cost of animal products neglects their massive environmental and health impact. If animal products reflected their true cost, becoming vegan would actually save money, that could therefore be spent in donations to charity. Unfortunately, we don't live in a world where the cost of goods and services reflects their positive or negative impact. Yet, precisely, by transitioning to a vegan life (or as vegan as possible), we are collectively shifting the market in that direction.
The author could apply a similar argument against transitioning to green energy: Instead of investing in clean energy today, humankind could spare that money and sacrifice, and spend it on saving human lives. But clearly, in the long term, we save more lives by moving to clean energy now than in the future, when it may be too late.
I know that the author wanted to talk solely about the ethical aspects of veganism, and not necessarily the health and environmental ones. But, given that his conclusions are economical, it is naive to neglect those other aspects in the conversation. Deciding to go vegan today (and helping spread the message) may have an individual cost today, but it has a positive long-term impact that justifies that initial cost.
Finally, I also wanted to add that, for some people, becoming vegan may not be affordable. But those people in economic hardship will not donate significantly to charities anyway. Instead, for a large (and increasing) population, a vegan life is perfectly affordable, and also enjoyable. That is my case, living in a modern European city, and I know that it's also the case in many other cities in the US, UK, Australia, and elsewhere. So becoming vegan is neither more expensive, nor a big personal sacrifice.