Duke Leto wrote: Anyone (Glenn) know anything on:
The volume of operating subterranean mines?
The volume of non-operating subterranean mines?
Guesstimate of how much capital/energy/labor will need to go into hydroponics per unit of volume?
Here is the most comprehensive breakdown of US Coal Industry I’ve found on the net.
http://www.eia.doe.gov/cneaf/coal/page/acr/acr_sum.html
I hope this helps.
