> I suppose we can talk about how
> much miraculous technology would be required...

A lot can be done in principle with present technology given time I
think. Given a few hundred years, it's a lot easier to cover the
Sahara with solar thermal plants or the North Sea with offshore wind
turbines than doing it in ten. And once they are built, yes, there's
still maintenance and replacement costs and all, but the capital
investment is then written off. My feeling is that the concept of
productive capital accumulation is often underappreciated when talking
long time spans.

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