Well you did say they that we may be looking in the wrong places. First off, we aren't looking, second, there wouldn't really be "wrong places" if they were global in scale. We have a pretty good understanding of global stratigraphy going back 500 million years. Surly someone would have spotted something out of the ordinary by now. Something not naturally occurring. Some heavy concentrations of minerals that are out of place. I'm not saying it's totally impossible, but it's highly improbable.
And yes, a wise society would reign in population. But I don't think you get there without the pain we have gone through, either. Who knows, maybe the found a way to harvest the energy of the sun incredibly efficiently without going through a destructive phase, but you don't get microprocessors, energy sources, and the knowledge to do it all without breaking a few eggs.
Saying it's arrogance to think otherwise is just you saying words. It's logical, too. It may be fun to fantasize about these things, but lets leave it at that, fantasy. Unless you have some evidence, you may as well try to convince me to believe in God.
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