In 1997, GISS showed that the Southern Hemisphere warmed from 1882 to 1910. Now they show the exact opposite.
Also in 1997, Hansen said he knew temperatures accurately within 0.07 degrees.
The annual-mean global-mean temperature anomaly in recent decades is estimated to have a two-sigma uncertainty of about 0.07°C due to incomplete spatial coverage of stations. Thus the relative rank of different years is uncertain for years whose temperatures differ by less than that amount.
So was he lying then, or is he lying now?