还有第二个问题：美国国会拒绝接受气候变化的新提案，理由是作为发展中国家的中国没有履行碳排放量的限制；由于美国政府拒绝接受人均及总排放量的限制 ， （ 这个限制分别约为限制中国水平的三到四倍。
There is a second obstruction as well: the US Congress refuses to face up realistically to the climate challenge, because China, as a developing country, is not obliged to accept compulsory carbon limits. Then, because the US refuses to take responsibility for its cumulative and per capita greenhouse-gas emissions – which are, respectively, roughly four and three times greater than China’s – the Chinese leadership refuses to make concessions.