[pololeono]

It is all about aesthetics. Humanity is also part of nature.

[falcor84]

As I understand it, it's not about aesthetics per-se, but rather that "nature" is a semantic concept defined by us humans for anything that is outside of the human sphere - i.e. something is "natural" or "out in nature" or "nature's way" if it's what would have been if humans hadn't been involved.

[g8oz]

In the manner of an algal bloom, yes.