Spector.au reports:

Typical of most such temperature series, it zigzags up and down while showing two rising trends: the first peaks about 1200 AD and corresponds with a period known as the Medieval Warm Period (MWP), while the second peaks in 1980 and then shows decline. In between, is the Little Ice Age (LIA), which according to the Northern Hemisphere composite bottomed-out in 1650 AD. (Of course, the MWP corresponded with a period of generally good harvests in England – when men dressed in tunics and built grand cathedrals with tall spires. It preceded the LIA when there was famine and the Great Plague of London.)

Ignoring for the moment the MWP and LIA, you might want to simply dismiss this temperature series on the basis it peaks in 1980: it doesn’t continue to rise to the very end of the record: to the year 2000.

In fact, this decline is typical of most such proxy reconstructions – derived from pollen, stalagmites, boreholes, coral cores and especially tree rings. Within mainstream climate science the decline after 1980 is referred to as “the divergence problem”, and then hidden.

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In denial of this problem, leading climate scientists have been known to even graft temperature measurements from thermometers onto the proxy record after 1980 to literally ‘hide the decline’. Phil Jones, the head of the Climate Research Unit, University of East Anglia, aptly described the technique as a ‘trick’.

Grafting thermometer data onto the end of the proxy record generally ‘fixes’ the problem after 1980, while remodelling effectively flattens the Medieval Warm Period.

There are, however, multiple lines of evidence indicating it was about a degree warmer across Europe during the MWP – corresponding with the 1200 AD rise in our Northern Hemisphere composite. In fact, there are oodles of published technical papers based on proxy records that provide a relatively warm temperature profile for this period.