IPCC第四次评估报告推断，全球变暖“极有可能”是人为造成的。
The IPCC fourth assessment report concluded it is "likely" that global warming is human-induced.
第四次评估报告发表于2007年，第五个预定从2013年开始2014年结束以分期方式发布。
The fourth assessment report was published in 2007; the fifth is slated to come out in installments starting in 2013 and finishing in 2014.
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