Cutting-edge technological developments – in renewable energy and hybrid or electric vehicles, for example – will be indispensable in building these cities (and, more broadly, a clean and efficient economy). Although much research remains to be done, such technologies are increasingly accessible.
举例来讲，可再生能源、混合动力车或电动车等尖端技术的发展在城市（从广义上看，清洁和高效经济）建设中起到的作用将不可或缺。虽然仍有不少研究工作要做，但类似的技术已经越来越实用。技术变革带来变化，但既得利益依然是最强大的对手。