What is the future of biodiesel?

Biodiesel has big potentials as alternative fuel such as eolic and sun energy.

A big obstacle for biodiesel is land productivity of actual plantations of vegetable oils.

Palm oil gives the best productivity but it is far too little to cover whole world population needs.

There are researches in algae oil production because algaes has an enormous productivity (per occupation of land) but production costs are far too high.