Efforts for an international agreement to fight global warming have to start at next week's climate change conference in United Nations, German Chancellor Angela Merkel and French President Nicolas Sarkozy said Friday in Berlin, according to dpa. In a joint letter addressed to UN Secretary General Ban Ki Moon, the two leaders said the political dynamic for such an agreement had to emanate from Tuesday's UN conference on climate change in New York. In order to reach a "global and ambitious treaty" at December's climate summit in Copenhagen, the negotiators have to receive "a clear mandate." It was only in this way would global warming be limited to two degrees Celsius over the pre-industrial level, the statement said. The World Climate Summit in Copenhagen has been set up to find a successor agreement to the Kyoto Protocol on Climate Change, which expires in 2012.
