Snarkhunter
Prince
The last 2 being solutions to our energy problems and oil dependence that failed due to fear.
Give me controlled fusion any day--if it's good enough for the Sun, it's good enough for me (And, as I read in my physics text, it's shocking how little H+ actually fuses at any given moment!) Either that, or else get out the dilithium & antimatter There's another CIV3 improvement that would be fun, fusion--or is it already in there? My games usually don't last very long in the modern era because I rarely go for a spaceship victory. So I don't remember the techs very well. Seems like it ought to be in one of the tech lines. . . .
As for Orion--since we can't have it in Civ3--yes, you'd have to build it in orbit. Or launch it from Antarctica. Or, perhaps, assemble it on the Moon, with lunar factories supplying most of the parts. Anorthosite runs 6% titanium, more than most earth sources; bound to be useful for something. . . .
kk