I don't know what you mean by "materialism," but I don't defend materialism in a cultural sense. On the contrary, I emphasize metaphysical emergence in nature. Artificiality emerges from nature's wildness, for instance, as does personhood from animality, and civilized art from nature's impersonal productions. If materialism amounts to social Darwinism, or to a crude, conservative deference to nature, I repudiate it.

If by "materialism" you mean naturalism, then I accept it, but I interpret naturalism in the above sense, which entails property dualism. So higher-level values can emerge.