http://www.skepticalscience.com/new-remperatu...<quoted text> Loehle averaged the data for the 18 sites and produced the plot below, with each point representing 30-year centered average temperature (Figure 2). Loehle notes The data show the Medieval Warm Period (MWP) and Little Ice Age (LIA) quite clearly. The plot also shows that 20th century warming is apparently dwarfed by events in the past. If you are curious about the apparent cooling near present, Loehle explains The series ends with a downtick because the last set of points are averages that include the cool decades of the 1960s and 1970s. Finally, we learn It is clear that the 1995-year reconstruction shown here does not match the famous hockey stick shape. Believe uswe noticed that fact immediately!
Figure 2. Mean of temperature data for 18 data sets. The last point represents the period from 1966-1995.(from Loehle, 2007)
Following publication of the first article, several errors came to light regarding how temperatures were reported from the various locations. At times, they were reported relative to mean global temperature in 1950, at other times, the base year was 2000. Errors regarding smoothing came to light, other issues were raised, and Loehle and co-author J. Huston McCulloch decided to re-do all the calculations, including improvements in terms of confidence intervals.
The improved plot below shows little change from the graph above, although for data reasons, the last point now represents the 29-year average temperature centered on 1935.(Figure 3). The two statistical wizards note The corrected data continue to show the Medieval Warm Period (MWP) and Little Ice Age (LIA) quite clearly. The confidence intervalsindicate that the MWP was significantly warmer than the bimillennial average during most of approximately 820 1040 AD, at the 5% level (2-tailed). Likewise, the LIA was significantly cooler than the bimillennial average during most of approximately 1440-1740 AD.
TYour two experts admitted they were likely wrong about the medieval period & their plots for recent temperatures are about the same as the people you call wrong.