content: It's definitely an interesting idea. My hesitation is that large-scale deployments with the currently proposed molecules (even if they can solve the current efficiency problems) can lead to long-term soil and groundwater contamination, when the inevitable leak/accident occurs.  For a fairly modern example, see what happened at Santa Susana Field Laboratory and in particular the contamination that occurred at the Atomics International area. That facility has been contaminated for over 50 years, nobody wants to foot the bill for cleanup, and several-hundred (and likely many, many more) workers who worked at or even just visited that site, have died (at young ages) from cancers of 'unknown origin'. Not to mention people in the surrounding suburban areas.