Before revision: Modifications on the Stevenson-type screen were made for uniform instrument measurements around 1880.NOAA National Centers for Environmental Information, Monthly Global Climate Report for Annual 2022, published online January 2023, Retrieved on July 25, 2023 from URL Geologic evidence (millions of years ) 400px|Reconstruction of the past 5 million years of climate history, based on oxygen isotope fractionation in deep sea sediment cores(serving as a proxy for the total global mass of glacial ice sheets) , fitted to a model of orbital forcing (Lisiecki and Raymo 2005)Supplement: and to the temperature scale derived from Vostok ice cores following Petit et al.(1999).
After revision: Modifications on the Stevenson-type screen were made for uniform instrument measurements around 1880.NOAA National Centers for Environmental Information, Monthly Global Climate Report for Annual 2022, published online January 2023, Retrieved on July 25, 2023 from URL Tree rings and ice cores (from 1 ,