Like you, I’ve been reading dire reports of declining species for many years now. They have the value of causing us to pay attention to species in trouble, and the sad fact is that the only species likely to endure are the ones we humans manage to pay attention to. There was a time when it was better, if you were a nonhuman species, to be ignored by humans because we trapped, shot or otherwise exploited all of the ones that got our attention. But in the past 40 years, we have killed all those millions of birds or, let us say, unintentionally caused a dramatic population loss, simply by going about business as usual.

Agriculture has intensified. So has development. Open space has been sharply reduced. We have simply pursued our livelihoods. We knew it was inimical to wolves and mountain lions. But we somehow trusted that all the innocent little birds were here to stay. What they actually need to survive, it turns out, is a landscape that is less intensely human.

The Audubon Society portrait of common bird species in decline is really a report on who humans are. Let me offer a proposition about Homo sapiens. We are the only species on earth capable of an ethical awareness of other species and, thus, the only species capable of happily ignoring that awareness. So far, our economic interests have proved to be completely incompatible with all but a very few forms of life. It’s not that we believe that other species don’t matter. It’s that, historically speaking, it hasn’t been worth believing one way or another. I don’t suppose that most Americans would actively kill a whippoorwill if they had the chance. Yet in the past 40 years its number has dropped by 1.6 million.

In our everyday economic behavior, we seem determined to discover whether we can live alone on earth. E.O. Wilson has argued eloquently and persuasively that we cannot, that who we are depends as much on the richness and diversity of the biological life around us as it does on any inherent quality in our genes. Environmentalists of every stripe argue that we must somehow begin to correlate our economic behavior  by which I mean every aspect of it: production, consumption, habitation  with the welfare of other species.

This is the premise of sustainability. But the very foundation of our economic interests is self-interest, and in the survival of other species we see way too little self to care.