Ethical realists hold that there are ethical facts that are the truth-makers of ethical beliefs -- facts such as the fact that torture is wrong -- facts that are similar in all metaphysically and epistemologically important respects to biological, psychological, and physical ones. Ethical realism faces a variety of objections, but the most important is its purported inability to account for the normativity of the ethical facts that it postulates. Some philosophers think that the normativity objection poses an especially acute challenge to ethical naturalism because of its view that the ethical properties and facts are natural ones. David Copp aims to explain the naturalist's position, why it is important, and why we might find it plausible despite the objections it faces. He argues that, in fact, ethical naturalism is better positioned to answer the normativity objection, and to explain the nature of normativity, than its alternatives.