Michael Mann says climate models cannot explain the Medieval Warming Period – I say they can't even explain the present

Ice core data shows CO2 levels changed less than 10 parts per million from 1600-1800 during the MWP. From the Hockey Schtick:  A new paper from Schurer et al (with Mann as co-author) finds that climate “models cannot explain the warm conditions around 1000 [years before the present, during the Medieval Warming Period] seen in some…

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Woods Hole embraces the Medieval Warm Period – contradict Mann's proxy data

“The more interesting and potentially controversial result is that our data indicate surface water temperatures during a part of the Medieval Warm Period that are similar to today’s…” “Although there are significant uncertainties with our own reconstruction, our work raises the idea that perhaps even the Northern Hemisphere temperature reconstructions need to be looked at…

What are, in fact, the grounds for concern about global warming?

By Javier This is an answer to the Geological Society of London position statement on “Climate Change: evidence from the geological record,” published in November 2010, and the addendum published in December 2013. They can be found at: https://www.geolsoc.org.uk/climaterecord This article was first written as a long comment contributing to a discussion over the Geological…