[DamnthatDavid]

Yes, I see the problem, but you can not just suddenly cut off oil. You need to ease it off, transition like. The next step would be Hydrogen, Hybrids And it will last maybe 50 years before:
A: They find a renewable energy source to replace oil. (I going for thermal)
B: We all die in a nuclear war over the last remaining oil fields.


I still think the half in oil need is off a bit. Most hydroelectric dams don't run at full capacity. I know the ones in the Northwest don't.