Looking ahead, the world economy will need to introduce alternative technologies that conserve energy, water, and land, or that enable us to use new forms of renewable energy (such as solar and wind power) at much lower cost than today. Many such technologies exist, and even better technologies can be developed.
展望未来，世界经济需要引进保存能源，水和土地或者可以使我们以比现在更低的成本使用新型可再生能源（如太阳能和风能）的替代技术。已经存在许多这样的技术，而且可以开发更好的技术。一个关键的问题是，替代技术通常比现在使用的消耗资源的技术更昂贵。