Guest post from Andrew Cooper, AKA ‘Scute’. It’s a bit hard to tell if the baseline for temperature on video version from the IPCC press conference runs from 1861 or 1851, so we’ll let the talkshop readership decide. They certainly did switch the cumulative emissions baseline. It all makes a difference to presentational impact, especially the misleading slope in temperature from 2000-2010.
graph from page 36 of the Summary for Policy Makers (SPM) with the version shown at the IPCC press conference below :
The graph includes an unabashed cherry-picking of temperature data points (2000, low and 2010, high) so as to fit the linear relationship the IPCC are promulgating between total accumulated CO2 and temperature since the late 19th century. It is true they can say they were just plotting in tens of years, to show a long term trend from 1860 but the current 15-year standstill is now turned into a soaring rise. They, of course, know this is a complete misrepresentation of the truth but are hiding behind the fig leaf argument that the decimal system dictates that you choose years with a ’0′ on the end.