This is for a guest commenter who is having trouble with baselines and anomalies. He is not the only one.
Here is a chart that shows UAH and GISTemp on the same 1981-2010 baseline. They show very similar warming over that period. Data sources: NASA and UAH
The charts below show GISTemp global land and surface temperature anomalies with different baselines. It doesn't matter what baseline you use, the global surface temperature has still gone up by the same amount.
Data source: NASA
Anomaly from twentieth century mean - showing approx: 0.8 degrees higher than 1880.
Anomaly from 1951 to 1980 mean - showing approx: 0.8 degrees higher than 1880.
It doesn't matter what the baseline years are. The temperature difference between now and a point in the past will be the same, no matter what years you used as the baseline average.