Though opinions were still poles asunder, participants at the Petersberg Climate  Dialogue emerged from three days of discussion which ended Tuesday with guarded  optimism.
They based their optimism on hopes of reviving stalled debate  and rekindling practical cooperation among those who attended the United Nations  climate change conference in Copenhagen last year.
The Petersberg  dialogue was co-hosted by Germany and Mexico which is to host the follow-up to  the Copenhagen conference in November.