I always thought the whole concept of "natural" and "unnatural" was extremely flawed and downright stupid. Let me explain. Okay, what is nature? Well, the natural world. Reality is nature. Every process in the universe is a natural process.
One might say "well if humans are the driving force of a process that makes that process artificial."
Why response is always: Why? Humans are biological beings. We're -blam!-ing animals.
Literally. We're primates. You don't call the process of a forest growing "unnatural." You don't call a beaver damn "unnatural." But, when humans build a building it's an "unnatural structure." -blam!-ing why!? That's complete nonsense.
You cannot talk about biological life as being natural and then single out humans are being some beings of unnaturalism. We exist in nature, as a part of nature and everything we do is natural.
Which mean guess what? Homosexuality is natural. So is murder! Some -blam!-ing element we made for only 0.25 seconds before it decayed away was naturally created because it was produced by the product of a natural biological process.
Long story short; the human language is -blam!-ing stupid and makes no god damn sense. Natural is a horrible word that is empty and meaningless.
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Unnatural refers to something that is out of the ordinary and does not usually occur. Basically, buildings are "natural" in a city environment, but unnatural in a jungle.