looking at the chart though completely supports my most important conjecture. It is that the primary cause of the increasing chill in the northern hemisphere is caused by human driven desertification of the Sahara and the Middle East.
Otherwise we see erratics likely caused by geologic events or a cyclic oceanic effect which is not particularly obvious provided this chart is highly accurate. Over laying all that is the solar variation as well which should be almost undetectable in this type of chart but not so in terms of a temperature chart. Recall ice cover lags warming as we have just observed..
New Paper Indicates There Is More Arctic Sea Ice Now Than For Nearly All Of The Last 10,000 Years