All this may lead some to wonder why time-consuming international negotiations and UN climate summits are needed at all. But the fact is that this groundswell has in large part been catalyzed by the existing targets, timetables, and innovative mechanisms of the UN climate treaties, and not least by the momentum generated around the often-criticized 2009 Copenhagen summit.
所有这些可能都会引发某些人的疑虑，耗时费力的国际谈判和联合国气候峰会究竟意义何在？ 但实际情况是上述积极潮流在很大程度上得力于联合国气候条约现有目标、时间表和创新机制的推动，特别是备受诘难的2009年哥本哈根峰会后形成的势头。