First generation biofuels are n't enough and second generation probably are n't either - plus they wo n't be ready . One can use oil shales and I was unhappy to see shale mentioned in the speech . Even with tax credits for cars wo n't change the fleet quickly - that will take a couple of decades .

Question: What type of subject is the narrator interested in ?
Answer: They are interested in sports fuel .None of the above choices .They are interested in energy .They are interested in taxes .