biofuels are good or bad?

these days everyone seems to talk about the biofuels (in support of these or opposition). I will say i will support the production of the biofuels with a condition that all the subsidies given to the agriculture for food are not given to the production of the biofuels. In my view if biofuels are cheaper after the subsidy than it is better to buy oil and why waste the public money on generating biofuels. If biofuels are cheaper in absolute terms without any subsidy than we need to talk about the carbon emission as well. are the biofuels generate less carbon emission in total. I am emphasizing on total carbon emission because lots of fertilizers are used in production of crops and there is carbon as well.
just because it is fancy, we should not support it. if it has merit and logical superiority over the oil then of course we should support it. even if we produce lots of biofules and food prices go up even then the inflation will go up and lots of people will die of hunger in poor and developing countries. main purpose of the biofules is not to keep the oil prices low, but to keep the inflation in control. if that can not be done then there is no point of having oil price at $40 per barrel by using all the crops for biofuels.