Originally Posted by FilmOnly
Yeah but, there is more to the problem than square feet per house, NYC sure as hell doesn't grow its own food or supply its own water or fuel. Here in the US we maintain a lavish, high energy consumption lifestyle by exploiting not only our own land mass, but that of many other countries, a source of some of our current problems.
I concur that thorium lenses are unlikely to be of major import in the general scheme of things. Glass and ceramics from earlier periods used uranium compounds to get interesting yellows too.