"(2) Projections indicate that by the year 2050 there will be 2.5 billion motor-vehicles
in use around the world.,...Today the figure is far short of a billion.
China will have as many motor vehiles as the USA by then."

Extrapolations like this are very usefull when in the case of this one they indicate that something hugh, a phase change if you will, must occur. It's clear that well before 2050 the primary motive power for vehicular transport will NOT be oil based.

Here's a great resource on electric vehicle technology...

http://www.daughtersoftiresias.org/greenwiki/Electric_vehicle

There will be huge fortunes made and lost in the transitioning technologies.