TOEFL Listening: ETS-TOEFL听力机经 - 99HX8W8C33V54WH3P$

A student mentions that trees can save energy by providing shade. What other benefits does the professor mention that can be accounted for in the benefit-based approach? A. Reducing the amount of pollution in the air B. Helping to decrease flooding C. Making streets more attractive for retailers D. Reducing the costs of repairing pavement