You just know in your gut that a revolution in transportation is just around the corner. It is! Sure gas or solid fuel vehicles will be around as hybrids before the new technology. But, they are only stopgaps to the ultimate substitution.
Electric energy driving everything from transportation to homes has to be the way forward. Over time smaller and smaller lighter and lighter energy units will power everything, make everything mobile, efficient and capable.
The economies of scale in manufacture will eliminate numerous traditional industries and create new ones.
Yes, we are headed towards a cleaner world. Just look and see:
http://www.teslamotors.com/modelx
RT