The real driver for change in climate negotiations is the call for voluntary national commitments that was issued in 2009 at COP 15 in Copenhagen.
改变气候变化的真正驱动力是2009年哥本哈根第15轮缔约方会议正式呼吁的基于自愿的国家承诺。
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COP 17 as it was known is the 17th conference of parties, an annual meeting of world governments and interested parties aimed at forging a large scale agreement to tackle the climate change.