Aldo Leolpold on the 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.” (A Sand County Almanac, page 224-225.)

One can write about the wildness of nature because natural selection is wild, but it is hard to write about morality in the context of nature because the way of nature – natural selection, or chance and necessity – is indifferent to morality.

Leopold tried to avoid a human-centered ethic, but he did not succeed. Preservation of the integrity, stability and beauty of nature is something humans sometimes seek because we associate them with existence. Natural selection has no such aim – no beliefs, no values, no purposes.

Natural selection is indifferent to existence and nonexistence. Humans are not. We have realized that our existence depends on the existence of the web of life of which we are part. We value that web, like we value integrity, stability and beauty, because the thought of nonexistence is so awful to us.

Integrity, stability and beauty: these are virtues or values. Philosophers have associated them with what is eternal and, therefore, transcendent. It is a strain to sustain belief that they are connected with nature or the cosmos after Darwin. It is hard to sustain belief that existence matters.