I heard too that the maintenance headaches caused them to start pulling the cars back in a nd destroying them long before the lease was up.
At any rate, the way things are now, a gasoline powered car has less impact on the environment than any of the full-on "green" cars. That's when you include the energy costs to manufacture, build, market, operate - everything involved from the first bolt to the last squeak of the crusher.
The "green" operating cars don't make up for the mess they made being built.
Hybrid cars are the best bet so far in terms of environmental impact.
I believe I heard somewhaere that the guy in that video is being courted by European countries for the technology. A place like Greenland (or is it Iceland, I forget) that is about 85% self sufficient in terms of it's energy consumption could use that technology to shed a good chunk of that last 15% of dependancy on outside resources.