Is it time to introduce Compressed Natural Gas as a vehicle fuel yet? CNG has the advantage of being just about the cleanest burning fuel out there, it is widely available with new supplies coming on line all the time, and when adequate safeguards are in place and maintained, it is probably almost as safe as Diesel fuel.
Much greater care while refueling is essential, because even the smallest leak has the potential of becoming a blowtorch, and in the event of a rupture, the least spark can create a lethal fireball that can flatten city blocks and cause a very intense firestorm that approaches a high explosive or small nuke.
Cruel fact in conjunction with an atmosphere that is 20% oxygen, one of the most destructive chemical elements in the Universe (only fluorine is more reactive, and it is NEVER found in a free state.)
CNG seems a good idea. Are you arguing for a government program?
Oh yeah, there will shortly be a string of posts arguing that only 195os technology is reasonable. hehe