[Windflier]

Has mankind been here before?

I think we have.

There are fields of green glass scattered here and there around the world. How'd they get there? They're older than human civilization, and there's no natural process to explain their existence.

We humans know how to make fields of green glass now. I think that humans learned it before, and lost it all because of our collective insanity. Let's hope we make it through that phase this time.

[no-to-illegals]

Have long thought your thought.

[Smokin' Joe]

That has occurred to me as well. If we were at some point not the engines of our own destruction, at least one divine intervention occurred in the past. I wonder if Ice Ages have not disrupted civilization, along with other relatively catastrophic events, but am faced with the fact that in lieu of cooperation, 'bottleneck' near extinction events would inevitably cause a grave loss of technology and knowledge, regardless of cause.

Toss in some cultural predilections for destruction (frequently coupled with the intense desire to dominate by any means) and it is a quick trip back to 'nasty, brutish, and short', scrounging the ruins for useful items.