TOEFL Listening: ETS-TOEFL听力机经 - 81_Z34PO3WVA5YUKP$

What is the professor's opinion of the thermal depolymerization process becoming a carbon-neutral process? A. He thinks it is not likely to occur in the near future. B. He thinks it will happen only if the price of oil goes up. C. He thinks it will not happen until environmental groups get involved. D. He thinks that the amount of untapped oil underground makes a carbon-neutral process unnecessary.