I liked the sound of the hydrogen stuff that was shown on Top Gear.
There was that honda, they said it could be used with the current infrastructure, of petrol stations.
What I liked about it the most was that they said the price (given that virtually nowhere was supplying it) was about that of petrol. So if it became as widespread as petrol use, it would cost pence!
I also like the sound of nuclear fusion, but when I did a bit of research into it at school, years ago, it seems not to be practical, we don't have the technology to maintain such a thing. It's more of a dream solution than a practical solution.
Clearly something should be done to gain energy from the trillions of gallons of water that surround the planet. The best thing about getting energy from hydrogen is that it turns back into water, ready for use again. So it's a virtually infinite source of energy.
They do, but it's going to be more like enough to make it look like they're doing something, rather than enough to actually do something in the time there is.