Clearly, electricity isn't sustainable. Look at U.S. power generation: 51% coal, 20% nuclear, 16% gas, 3% oil. None of that is sustainable.

and...

So it's just an elementary deduction: If you are opposed to unsustainable practices, then you're opposed to the electric power grid. That sounds pretty medieval to me.

Therefore,

you are, by your own reasoning, either "medieval" or FOR "unsustainable practices."

Which is it?

I'm for unsustainable practices. Not forever, but for the time being. Keeping the lights on takes priority over sustainability.

That doesn't mean I'm in favor of senseless, wasteful consumption and growth. It also doesn't mean that I'm ignoring the limits imposed by the planet. I means that I think the best chance for long-term survival of the human race lies in modern, technical, industrial culture. If we let the lights go out, it's 100% sure we will perish like the dinosaurs. Our minds are our only chance.

I don't know about you, but my mind doesn't need to be plugged into the grid to work.  :-D