IPCC第四次評価報告書(AR4)のコアは不確かな未来予測よりも現在報告だろう。例えば、Annual fossil carbon dioxide emissions4 increased from an average of 6.4 [6.0 to 6.8] GtC per year in the 1990s, to 7.2 [6.9 to 7.5] GtC per year in 2000–2005 (…