Temperature data sourced from Vostok and EPICA ice core data (with polar amplification correction). Carbon dioxide data sourced from the Mauna Loa observatory for the last century, then ice cores (Vostok and EPICA), Zachos et al for the Cenozoic, GEOCARB III with correction from COPSE for the Ordovician glaciation, and Catling and Zahnle for the Archean. Future scenarios data sourced from IPCC.