In order to estimate sensitivity from past climate variations, one must identify and quantify the climate forcings. (realclimate.org)
The lack of certainty about past climate variations does not undercut what we have learned by studying current conditions. (skepticalscience.com)
«USING PALAEO - SCIENCE TO UNDERSTAND ClIMATE CHANGE IN AUSTRALIA... As the geographic coverage, time resolution and detail of palaeo - climate records have improved, it has become possible to identify the effects of past climate variations on high impact events such as fire.... (realclimate.org)