When I read about Adelaide's solar power bus, I am renewed with hope and reminded of Arthur C. Clarke's Three Laws -
1. When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.
2. The only way of discovering the limits of the possible is to venture a little way past them into the impossible.
3. Any sufficiently advanced technology is indistinguishable from magic.
Maybe it's not that dramatic a breakthrough... but nevertheless - next up, solar powered flying houses made entirely of tax-reversing, carbon-eating, dusts. Free to anyone, and outfitted with flat panel televisions.