Naturalistic fallacy

Wikipedia entry for Wikipedia: Naturalistic Fallacy

G.E. Moore argued that it is impossible to reduce value properties in general, and moral properties in specific, to some sort of natural properties.

Desire utilitarianism reduces value properties to natural properties.

Specifically, saying that X is 'good' means saying that 'there exists reasons for action for bringing about or preserving X'. Similarly, calling X 'bad' means that 'there exists reasons for action for avoiding or eliminating X'.

Furthermore, desire utilitarianism holds that desires are the only reasons for action that exist. Consequently, any claim about X being 'good' can only be true if and only if there are desires that will be fulfilled by bringing about or preserving X. In the absence of desires, there are no value.

G.E. Moore defends his Naturalist Fallacy by appeal to his Open Question Argument