> The point is that solar energy does not demand a high efficiency
> conversion.
> It's "free" so a lower efficiency can be justified as long as the cost
is
> minimal.

It's only "free" if the real estate to collect it is free. 
Rooftop solar heaters work that way, because we were already using that
area for something, and the solar heater doesn't impact that use.

If you're trading farmable land, then efficiency matters.
It will be a diminishing returns curve of course, but it does matter.




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