SPS doubts

> Reprocessing, mining sea-water, or tearing up the landscape for granite
> to extract very-low-grade uranium from would get more, but they won't be
> pretty.

Reprocessing, mining sea water, using thorium, blah, blah, would get
*much* more - millenia, at current energy consumption levels, or
centuries, if we work with a ten-fold increase. I don't know if those
techniques will be "pretty", but provided that they can be used in an
economically viable way, that will be enough.