Bio fuel generations

Question

can someone tell me what 1st 2nd 3rd and 4th generation biofuels are and how they are all different. also which is most efficent for the use of the land they use.

Answer 1

All a waste, why burn food?

Answer 2

Biofuel have come to a point that you can make it at home. And the best thing is that you need not use NEW cooking oil or vegetable oil.

You use WASTE vegetable oil and convert it into Biodiesel.

That is not waste, it's reuse and recycle.