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Ministers and representatives from 32 countries and the European Union wrapped up two days of talks in Berlin on Tuesday with a joint statement urging developed nations to take the lead in stopping global warming.
The talks were aimed at laying the groundwork for the 19th Conference of the Parties to the U.N. Framework Convention on Climate Change (COP19), to be held in Warsaw, Poland, in November.
The main theme of the talks was an international framework from 2020 that would include China and India, to replace the Kyoto Protocol, which required developed countries to cut greenhouse gas emissions.
Many countries expressed support for the United States' proposal that each country should set its own reduction target, while others argued there should be obligatory targets as under the Kyoto Protocol.
Japan, the United States, China and India were among the participating countries.
Ken Saito, parliamentary secretary of Japan's Environment Ministry, told reporters that he had called for international regulations on hydrochlorofluorocarbons, which deplete the ozone layer, during the two-day event.
The new framework is scheduled to be adopted at the end of 2015.