Impressive study indeed. It also shows what we all know. Biofuels can NEVER fill up the role of fossil fuels for transportation.

But it can be a part of the solution. With fossil fuels mostly gone, I guess that the biofuels should be used for important functions in the society.

For private transportation needs, what is viable seems to be electrical vehicles (with now known techniques that is). Then there comes the question if it is possible to manufacture all the cars with batteries that would be needed, if the private motoring should continue as today?

Probably not.

People will be forced to drive less, take the buses, the trains, the bikes, whatever. It'll be a long time until private cars can become a reality again, I bet.

"It will be a long time until private cars ..."

You imply that there will be some sort of nice, orderly powering down.

I don't believe that - at least not for those that matter (the rich).

In all honest only a tiny fraction of worlds population ever had a private car - and it's not possible to ever extend such a luxary to the world.

We have a lot of rich people who don't give a damm;
not about other peoples lives - in their own country or
others. They are currently fueling the destruction of China and, in essence, the planet. American delusions of grandure and printing cotton candy money are allowing the destruction to continue.

We will see the destruction of any welfare and social supports as those who have money keep on keeping on regardless of the destruction around them.

The military will go to biofuels as will Walmart and others and it will take food from the mouths of those who are helpless (read cashless).

Remember the carbon footprint of China and India and Indonesia is that of the CONSUMING FIRST WORLD - mostly the USA!

We have cleaned our air by moving all of the dirty mfg work offshore.

The capitalist economic system is utterly without morals or regard for anyone or even the health of the planet. The proof surrounds us and the whirlwind will not stop.

Cars are just one symptom of living an unsustainable life. I personally like the motto of "suppersize me". Ie my car, my body, my house, my possessions, my ego, ...

I see it every day with the god forsaken SUVs delivery obese parents and soon to be obese preschoolers and they're living in homes 2x larger than they need to be ... Often they're within walking distance of the place they are driving too...