In 1984, Hansen forecast symmetrical sea ice loss and warming at both poles.
That didn’t work out so well. Instead of warming and losing ice, Antarctica cooled an gained sea ice – as this 2006 NASA image shows.
But then something very typical of GISS happened in 2007. The data suddenly changed. Antarctica’s long term temperature trend changed from strong cooling, to warming.
NASA justified this trend reversal with the following statement : The scientists estimate the level of uncertainty in the measurements is between 2-3 degrees Celsius.
So they switched a long term cooling trend into a warming trend, based on measurements with an error bar more than an order of magnitude greater than the trend. In other words, Hansen’s Ministry Of Information didn’t want a map out there showing Antarctica getting cooler.