Thanks for the thoughtful reply. I think the "shipyard guys" are trying to tackle 1 & 2 (as well as lessening the concrete on #3). Though, I would be surprised if your numbers for #3 are right... it seems odd to me that a ton of concrete would produce about a ton of CO2 (but maybe it's just one of those counter-intuitive things!). Thorium is interesting for #3/mining because it is produced (unrefined) by rare-earth mines (unlike special-purpose uranium mines). As for #4, I would argue simply that it is "better than coal" insomuch as we have neither found a good way of dealing with the fly-ash and soot-ash from coal power plants (yet they operate); i.e. ash ponds & coal ash impoundments.
I'd probably donate it to the Thorium guys. Either the ones that just built the reactor research lab in Texas, or the shipyard ones. If coal becomes economically obsolete, the gigatons of CO2 will drop off like a rock.
Individually, yes. Thousands of cows, thousands of "dancing"s, thousands of roombas, and thousands of "on the moon"s.