(IPCC SR15 Ch1 2018، ص. 54): "These global-level rates of human-driven change far exceed the rates of change driven by geophysical or biosphere forces that have altered the Earth System trajectory in the past (e.g. , Summerhayes, 2015; Foster et al. , 2017); even abrupt geophysical events do not approach current rates of human-driven change." Allen, M. R.; Dube, O. P.; Solecki, W.; Aragón-Durand, F.; et al. (2018). "Chapter 1: Framing and Context"(PDF). (IPCC SR15 2018). pp. 49–91.
(IPCC AR6 WG1 Technical Summary 2021، ص. 67): "Concentrations of CO2
, methane (الگو:CH4), and nitrous oxide (الگو:N2O) have increased to levels unprecedented in at least 800,000 years, and there is high confidence that current CO2
concentrations have not been experienced for at least 2 million years." Arias, Paola A.; Bellouin, Nicolas; Coppola, Erika; Jones, Richard G.; et al. (2021). "Technical Summary"(PDF). (IPCC AR6 WG1 2021).
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