Nonetheless, in the IPCC’s influential 2007 assessment of climate change, the panel’s Working Group II (charged with assessing the potential impact of global warming) chose to cite one, then-unpublished study that supposedly found that global warming had doubled damage costs over the past 35 years. In fact, when this study was finally published, it stated categorically that there was “insufficient evidence” to link the increased losses to global warming.
但即便如此，在 2007 年 IPCC 举行的关于气候变迁的评估中，该专家小组的第二工作小组（负责评估全球变暖的潜在影响）选择引用一份当时还未曾公开发表的研究，该研究认为在过去 35 年间全球变暖所造成的损失增长了一倍。谁知当这一研究最终发表时，却明确声明在损失增加和全球变暖之间找不到“足够的证据”证明两者之间的联系。换句话说，第二工作小组的报告是完全错误的。