I am a Climate Change (human caused) agnostic.

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453. Ah! yes, the Other Warmings

The orbital and solar environment of the Earth during the Roman and Minoan warm periods was the prime reason for those. As for the Medieval Warm Period the signal caused by that is worldwide but it seems that the warming was pretty much confined to Europe. You might like to find out why the graph you display so proudly missed one, by the way, the Dark Age Warming.

You don't actually look at any other sites than Watts and his sycophants, do you? And I bet you hang on every word from Demented Lord Monckton. The actual fact that of peer reviewed paper after peer reviewed paper discovers the same warming and sees the same results from Anthropogenic Global Warning is neither here nor there. You and the other purblind denialists will parrot the idea that there is a "conspiracy" to "sell" AGW; ignoring the small problem that the very scientists who are telling you the lies you believe make their money from the fossil carbon industries and entrenched interests like the Kochs.

Oh, yes, that little graph of yours is not a GLOBAL proxy temperature record it is a record confined to Greenland; so, of course, it shows massive variation plus the minor problems that:
1) signals in Central Greenland tend to lag global trends by 50 or more years and
2) the mass of ice damps any global warming observed whilst amplifying any cooling trends

Now, go away and actually learn something.