[Ernest_at_the_Beach]

From the comments:

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John F. Hultquist says:

June 15, 2012 at 6:31 am

Nice chart here:

http://www.wired.com/wiredscience/2012/02/the-mysterious-missing-eruption-of-1258-a-d/

[Ernest_at_the_Beach]

The volcano eruption at El Chichón, Mexico: *( linked above.) gets discussed in the Wired article

[CedarDave]

John F. Hultquist says:
June 15, 2012 at 6:31 am

Nice chart here:

http://www.wired.com/wiredscience/2012/02/the-mysterious-missing-eruption-of-1258-a-d/

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Not so nice in my opinion. Note the familiar "hockey stick" rise at the end. Look who produced it: "The global temperature anomalies from 1200-2000 A.D., showing the dips associated with volcanic events, including the missing 1258 eruption. Part of Figure 2 from Mann et al. (2012)"

Anything to attempt to show tree rings are the key to determining cooler temperatures before the present day.

Mann, M.E., Fuentes, J.D. and Rutherford, S., 2012, Underestimation of volcanic cooling in tree-ring-based reconstructions of hemispheric temperatures. Nature Geoscience, doi:10.1038/ngeo1394.