Let's start with a dirigible to carry wind generators. The wind is eternal up there...
http://www.magenn.com/
Now, how about the new Prius? I mean, an hydrogen car, at last, by Honda: the FCX Clarity.
http://www.nytimes.com/2007/12/09/autom ... HONDA.html
Finally, big news: USA thinks about increasing efficiency of their fleet.
http://www.nytimes.com/2007/11/28/us/po ... du0/08hfuw
From 27.5 mpg to 35 mpg (that's something like 14 km per liter, not enough for some people, I imagine, but it's a start).