While present in palaeoclimate records, the drivers behind 20 - year climate variability are poorly understood. (nature.com)
Here we present a stricter approach, to improve intercomparison of palaeoclimate sensitivity estimates in a manner compatible with equilibrium projections for futureclimate change. (climatestate.com)
the figures in the above were based on: «Deriving global climate sensitivity from palaeoclimate reconstructions» Hoffert and Covey, Nature Vol 360, 10th December 1992. (illconsidered.blogspot.ru)