[agere_contra]

It was warmer during the Medieval Warm Period (a global warm period extending from roughly 1000 to 1200 AD) than it is today.

The only heavy industry taking place during the MWP was cathedral-construction.

Get them to explain that.

Many temperature reconstructions showing the Medieval Warm Period - and it’s global extent - are available from the Medieval Warm Period database at

http://www.co2science.org/data/mwp/mwpp.php

Here are just a very few of them summarized - very briefly - by me in a word document.

http://www.imsaho.com/download/AGW_MWP_EVIDENCE.doc

[palmer]

It was warmer during the Medieval Warm Period (a global warm period extending from roughly 1000 to 1200 AD) than it is today.

Furthermore, sea level was up to 1/2 meter higher than today. There is solid evidence that the Roman Warm Period was even warmer and it was warmer a few thousand years before that. In general we were in a sharp cooling trend until the recent uptick (late 20th century) and we should be thankful for some small amount of warmth before it gets cold again.

You might also point out that the effects of the solar activity slowdown starting in 2008 have yet to be felt. The ocean has thermal intertia and is keeping the atmosphere warm for now. But in all likelihood we are looking at a few decades of cooling and some hardships (late frosts, early fall freezes, etc)