Most likely, all three of these methods will have to play a role. The effort to reduce greenhouse gases will require decades of action, but, given the long lead times in overhauling the world’s energy systems, we must start now.
很有可能，这三种方法都必须发挥作用。要减少温室气体还需要很多努力，但是，鉴于改革全球能源系统需要很长时间，我们必须现在就开始。富国应当担当起领头羊的任务。