One reason is that we don’t know how to store the energy from these sources: when the wind doesn’t blow and the sun doesn’t shine, what powers your computer or the hospital’s operating room?
原因之一是我们不知道如何贮存这些资源生成的能源：如果不刮风也不出太阳，什么能给你的计算机或是医院的手术室提供动力？