The End of Smog

The End of Smog

It has been said that if all the automobiles in the world were to be placed bumper to bumper in one continuous line, some fool would still try to pass them. And so it will be until . . . the end of smog.

When the world's petroleum supply is finally depleted, chemists will have to produce gasoline from coal. At modern consumption rates there is still enough coal in the world to last thousands of years. It almost appears that cars will be able to run forever. However, when coal is finally gone, the internal combustion engine at long last will be laid to rest and petrochemical smog will slowly disappear from the cities — forever.

From the book: 
Our Fascinating Earth