For GSS Climate Change chapter 7. Excerpt:  A new paper published in The Quarterly Journal of the Royal Meteorological Society fills in the gaps in the UK Met Office HadCRUT4 surface temperature data set, and finds that the global surface warming since 1997 has happened more than twice as fast as the HadCRUT4 estimate. [see short video summarizing the study's approach and results] ...HadCRUT4 missing accelerated Arctic warming, especially since 1997. ...NASA data fails to include corrections for a change in the way sea surface temperatures are measured - a challenging problem that has so far only been addressed by the Met Office. The Berkeley Earth Surface Temperature (BEST) project used a similar approach as NASA, but with a statistical method known as "kriging" to fill in the gaps by interpolating and extrapolating with existing measurements. However, BEST only applied this method to temperatures over land, not oceans.... http://www.theguardian.com/environment/climate-consensus-97-per-cent/2013/nov/13/global-warming-underestimated-by-half. John Abraham and Dana Nuccitelli, The Guardian.