Ban expressed hope that the United States, the world's largest greenhouse gas emitter , would take the political lead in searching for a successor to the Kyoto treaty, which expires in 2012.
Ban expressed hope that the United States, the world's largest greenhouse gas emitter , would take the political lead in searching for a successor to the Kyoto treaty, which expires in 2012.
他希望美国能够在政策上带领全球达成诸如2012年到期的《京都议定书》的协议。