I downloaded the PDF from that URL years ago, for free, no membeships, etc.  Their main graph is on their page 2 of the PDF.<p>By eyeball, their graph looks a lot like the graph in the Wikipedia page you gave.  I was unsure just when the Medieval Warm Period was, but the Wiki graph seems to say it was near year 1000.<p>My eyeball reading of the graph in the PDF says that the temperature in year 1000 is essentially the same as in year 2006 when the PDF was published, and the increase from year 900 to year 1000 was much like the increase from 1906 to 2006.  I may be off by some 0.1 C or some such, but there are several curves so that about get to take your pick.<p>Bottom line:  Year 1000 wasn&#x27;t a disaster and wasn&#x27;t caused by humans releasing CO2, so I&#x27;m not much worried about now and not convinced that the current temperature or recent increases were caused by CO2.<p>E.g., was the Little Ice Age caused by less CO2?  I doubt it!