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@Lemming
Unhealthy is a human concept relative to itself.
Whereas stuff is and stuff evolved and is evolving.
The refinement of metals and the development of plastics is undoubtedly an evolutionary necessity, and their effects upon us are simply a consequence thereof.
Perhaps.
Or maybe a few billion years from now, the Earth will be inconsequentially destroyed, and we will have gotten nowhere else and achieved nothing of universal significance.