To add to Terrel's comment, the land based thermometer database has been "tweaked" so much now to show a positive warming that it contradicts satellite measured temperature data.
The reality of temperature is that the rate at which temperature changes varies over time. The most prominent variable is the sun.
Graph 3 shows the rate of warming curves for GISTEMP, NOAA, UAH, and RSS. (Note that the satellite temperature series did not exist before 1979.)
All of the rate of warming curves show good agreement with each other. Peaks and troughs line up, and the numerical values for the rates of warming are similar. Both of the satellite series appear to have a larger change in the rate of warming when compared to the surface series, but both satellite series are in good agreement with each other.
Some points about this method:
1) There is no cherry-picking of start and end times with this method. The entire temperature series is used.
2) The rate of warming curves from different series can be directly compared with each other, no adjustment is needed for the different baseline periods. This is because the rate of warming is based on the change in temperature with time, which is the same regardless of the baseline period.
3) This method can be performed by anybody with a moderate level of skill using a spreadsheet. It only requires the ability to calculate averages, and perform linear regressions.
4) The first and last 5 years of each rate of warming curve has more uncertainty than the rest of the curve. This is due to the lack of data beyond the ends of the curve. It is important to realise that the last 5 years of the curve may change when future temperatures are added.
The rate of warming curves for all 4 major temperature series show that there has been a
significant drop in the rate of warming over the last 17 years. In 1998 the rate of warming was between +2.0 and +2.5 °C per century. Now, in 2015, it is between +0.5 and +0.8 °C per century. The rate now is only about 30% of what it was in 1998. Note that these rates of warming were calculated AFTER the so-called “Pause-busting” adjustments were made.