A few weeks ago, we invited readers to make an argument for the ethics of eating meat. Thousands of readers submitted essays, and thousands more voted on the finalists that we posted online. Our panel of judges — Mark Bittman, Jonathan Safran Foer, Andrew Light, Michael Pollan and Peter Singer — chose the essay below as the winner. It will be published in the May 6 issue of the magazine.

As a vegetarian who returned to meat-eating, I find the question “Is meat-eating ethical?” one that is in my head and heart constantly. The reasons I became a vegetarian, then a vegan and then again a conscientious meat-eater were all ethical. The ethical reasons of why NOT to eat meat are obvious: animals are raised and killed in cruel conditions; grain that could feed hungry people is fed to animals; the need for pasture fuels deforestation; and by eating meat, one is implicated in the killing of a sentient being. Except for the last reason, however, none of these aspects of eating meat are implicit in eating meat, yet they are exactly what make eating some meat unethical. Which leads to my main argument: eating meat raised in specific circumstances is ethical; eating meat raised in other circumstances is unethical. Just as eating vegetables, tofu or grain raised in certain circumstances is ethical and those produced in other ways is unethical.

What are these “right” and “wrong” ways of producing both meat and plant foods? For me, they are most succinctly summed up in Aldo Leopold’s land ethic: “A thing is right when it tends to preserve the integrity, stability and beauty of the biotic community. It is wrong when it tends otherwise.” While studying agroecology at Prescott College in Arizona, I was convinced that if what you are trying to achieve with an “ethical” diet is the least destructive impact on life as a whole on this planet, then in some circumstances, like living among dry, scrubby grasslands in Arizona, eating meat, is, in fact, the most ethical thing you can do other than subsist on wild game, tepary beans and pinyon nuts. A well-managed, free-ranged cow is able to turn the sunlight captured by plants into condensed calories and protein with the aid of the microorganisms in its gut. Sun > diverse plants > cow > human. This in a larger ethical view looks much cleaner than the fossil-fuel-soaked scheme of tractor-tilled field > irrigated soy monoculture > tractor harvest > processing > tofu > shipping > human.

While most present-day meat production is an ecologically foolish and ethically wrong endeavor, happily this is changing, and there are abundant examples of ecologically beneficial, pasture-based systems. The fact is that most agroecologists agree that animals are integral parts of truly sustainable agricultural systems. They are able to cycle nutrients, aid in land management and convert sun to food in ways that are nearly impossible for us to do without fossil fuel. If “ethical” is defined as living in the most ecologically benign way, then in fairly specific circumstances, of which each eater must educate himself, eating meat is ethical; in fact NOT eating meat may be arguably unethical.