Carbon Neutral - Not really.
Well I just got back from my coast to coast whirlwind. Left-Right-Left.
I love travel, and even though this was for work. But I also know that air travel is really hard on the planet. So once in the Mass Transit friendly east coast, with high powered technical universities busily working on solutions to greenhouse gases I was.
The question is, does mass transit on the ground offset air travel. Probably not, but at least I didn't rent a car.
I really think it will be cool, as progressive lighting technologies show up in places. It will be cool. Literally, less heat than incandescent light bulbs.