Thank you, "eat less meat" was the obvious answer I was missing.
I know it's been pointed out elsewhere, but it's also possible to make a commitment to only eat meat that has been raised humanely. This is what I do. I only buy grass-fed beef and cage-free chickens and eggs. "Organic" labels on meat include some animal welfare protections as well (for example, ruminants must be allowed access to pasture in order to be labeled organic) so this is a good thing to look for.
This kind of meat is more expensive, which means I eat less of it, but I can still have a hamburger if I really want it and enjoy it pretty much guilt-free. An animal has still died, but I'm okay with that.
I have noticed that among philosophers, vegetarianism of one form or another is quite common. In fact, I became a vegetarian (technically a pescetarian) myself partly out of respect for an undergraduate philosophy professor. I am interested in finding out if there is a similar disproportion in the Less Wrong community.
I didn't request that this go into Yvain's survey because I want more information than just what animal products you do or don't eat; I'd also like to see nuances of the reasons behind your diet. There are a lot more shades than carnivore/vegetarian/vegan - if you want to be a vegetarian but are allergic to soy and gluten, that's a compelling reason to diversify protein sources, for instance. I'd also like to hear about if you avoid any plant foods (if you think they're farmed in a way that's environmentally destructive or that hurts people or if you have warm fuzzy feelings for plants, maybe). Here are some questions that come to mind: