How do we “know” that 1998 was the warmest year of the millennium?

This question could be rephrased as:"How warm was the medieval warm period?"

Steve McIntyre was assigned this topic for a talk given at Ohio State University on Friday May 16,2008. When the talk was posted on the Climate Audit blog on May 22 it drew a very positive response including this comment:

retired geologist says:

May 22nd, 2008 at 11:45 am

What a wonderful summary of your OSU talk. Everyone who reads your blog should read every word of this talk. As a 1961 graduate of Ohio State’s Geology department I’m especially pleased and proud you gave your talk at OSU. After reading this I don’t see how anyone with even a single functioning brain cell could still have faith in any of the IPCC work. In the past I’ve directed some pretty harsh comments at Steve. I take them all back. Sorry.

The outline of the talk can be found here.

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