参考答案

正确答案：D
解析：推理判断题。要求根据文章最后一段判断作者的态度，虽然没明说，但根据In 2001 the G.W. Bush administration announced it would abandon the Kyoto Protocol；because the United States produces about one quarter of the world's greenhouse gases, this was regarded as a severe blow to the effort to slow global warming．可以判断作者对那时美国方面的政策是持否定态度的，因此D正确。