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


They are interested in energy .