NASA currently shows a total of 1.5C warming in their land only temperature record.
But the 1999 version of their data showed about 0.7C warming from 1866 to 1998.
Archived from: http://www.giss.nasa.gov/data/gistemp/GLB.Ts.txt
NASA clearly does not agree with NASA, so which version is correct? A good way to check is by comparing the NASA data with satellites. Through the year 1999, NASA surface temperatures agreed with satellite temperatures – but have diverged sharply since then. NASA shows continued warming since the year 2000, but satellites show none.
This makes the post-2000 NASA data look very suspect. If we splice the satellite data on to the last reliable NASA surface temperatures from 1999, we see a total of 0.75C warming over the past 150 years – half of what NASA is currently showing for their entire data set.