Gavin is trying to hide the fraud by out of context visual trickery on nearly useless little graph.
I’m happy to indulge his claim that he has gone back in time and gotten some new readings from before 1900. The graph below normalizes his 2005 plot and his 2015 plot to the year 1900, making the pre-1900 data irrelevant.
Since 2005, Gavin has tampered with the post-1930 data linearly to add 0.3 degrees warming. It beggars belief that he thinks he could get away with this obvious fraud.
He has adjusted recent temperatures upwards by 0.3°C relative to 1930, and then claims a global temperature record by 0.02°C. The data tampering is fifteen times as large as his claimed global temperature record.
But Gavin’s malfeasance is much worse than it seems. Prior to 2005, GISS matched satellites reasonably well, but now is diverging at almost two degrees per century. Earth has been cooling over the last decade, but Gavin shows it warming.
So we have to add an additional 0.2°C on to the 0.3°C of cheating he already did prior to 2005. This makes a total of 0.5°C cheating, for a claimed global temperature record of 0.02°C.
Satellites show that 2015 is nowhere near the warmest on record. It isn’t even close.
The fraud going on at NASA is off-scale.