'Why do they need to replace HADCRUT3? Because the trend for last 15 years in HADCRUT3 is negative & therefore it must be exterminated – like Medieval Warm Period' -- 2) For some reason, after 2002, there appears to be corrections of .1 to .2C. Why was data ok in 1997-2002 & suddenly it was so bad it had to be 'corrected'. 3) What justifies a .2C adjustment up in 2007? Thats 40% higher! 4) ...they have adjusted up to make the the 'new dataset' hotter'