In littera encyclica papae Francisci "Laudato si'".
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"Warming of the climate system is unequivocal, as is now evident from observations of increases in global average air and ocean temperatures, widespread melting of snow and ice and rising global average sea level." IPCC, Synthesis Report, Section 1.1: Observations of climate change, in IPCC AR4 SYR 2007.
"Three different approaches are used to describe uncertainties each with a distinct form of language. . . . Where uncertainty in specific outcomes is assessed using expert judgment and statistical analysis of a body of evidence (e.g. observations or model results), then the following likelihood ranges are used to express the assessed probability of occurrence: virtually certain >99%; extremely likely >95%; very likely >90%." IPCC, Synthesis Report, Treatment of Uncertainty, in IPCC AR4 SYR 2007.
