Briefly explain ethical naturalism

Ethical naturalism is the theory that how things turn out to be can be derived from how the world naturally is. This means that my sense perception is an accurate means of gathering information about what exists . Therefore, moral facts, being natural, are a matter of discovery not decision. GE Moore states that naturalism is a reductive doctrine since is reduces moral values to something else: the natural world. For example, if one wants to find out whether their actions are morally justifiable, they would simly need to observe the physical state of being in the world around them and derive their answer from that.