北京大学教授张海滨对此持乐观态度。
Zhang Haibin, a professor from Peking University, is optimistic.
张海滨指出，如果中美两个温室气体排放大国不能克服合作障碍，两国关系将可能受损。
But, writes Zhang Haibin, if the world's two largest emitters of greenhouse gases do not overcome the obstacles between them, their relations as a whole may suffer.
但是，张海滨指出，如果中美两国不能采取确实的行动，全球应对气候变化努力将会无效。
But, writes Zhang Haibin, if the two nations cannot take genuine action, global efforts may yet be wasted.
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