"Whither Humanity"......Good thread Raedwulf, but I think we are looking at the problem the wrong way round if we are really interested in the survival of humanity.
Nuclear energy is the worst possible option....we still have no idea what to do with toxic waste.
It's like I said on another thread, we need to reform ourselves, if we keep producing more and more energy we will use it to make useless junk...anything which can be sold, anything which can be exchanged for peoples lives.

My view would be to cut energy production drastically, return to a subsistence economy where everyone was a contributer and a stakeholder.
There are far to many humans around, as a species, we are at the moment unsustainable.