Hello class we always discuss the alternate energy sources, one of them is bio-diseal. it can be a good substitute and can be cheaper and less polluted but it has various other aspects as well, Prof Ghorpade also disscussed few of these in the past.
Advantages of Biodiesel:

Biodiesel gives off less new carbon monoxide and carbon dioxide, since the gasses released during combustion are essentially the gasses absorbed from the atmosphere whilst the plant growing- unlike the gasses released by burning petrodiesel, which was carbon previously locked away.

Biodiesel is a better lubricant than petrodiesel, so it helps to extend the working life of engines.

Biodiesel gives fewer particulates when burnt, reducing risks from respiratory problems.

Biodiesel is easier to ignite than petrodiesel, meaning more complete, efficient combustion.

Disadvantages

Biodiesel is more expensive to produce.

If Biodiesel was used on a wider scale, more plants for oil would be grown as a cash crop. This may reduce the amount of food grown to feed the population in less economically developed countries.

Biodiesel gels at higher temperatures than petrodiesel, so tanks require heating in cooler climates.

Biodiesel degrades rubber hoses used on older engines.


regards
Himanshu