Chang says that with petroleum prices soaring and the possibility that supplies will be exhausted in the next 40 years, the world is frantically working to develop alternative energy resources.
張志毓表示，若以 40 年後石油即將耗盡，眼前油價大幅飆漲為考量，全球瘋狂發展替代能源之際，「省能而不省錢」是過程中的必然現象。