Chairman of the Administrative Control and Transparency Authority and the President of the Climate Change Conference (COP18), HE Abdullah Bin Hamad Al Attiyah met here with HE Todd Stern, the special envoy for climate change at the U.S. State Department on the sidelines of the Third Petersburg Climate Dialogue being held in Berlin.  Talks during the meeting dealt with the most important topics on the agenda of the Petersburg Dialogue, in addition to the latest preparations for the climate change conference (COP18) to be held in Doha at the end of November 2012.  The meeting was attended by Qatar\'s Ambassador to Germany, HE Abdurrahman bin Mohamed al Khulaifi and members of the delegation accompanying HE the Chairman of the Administrative Control and Transparency Authority.