<P>Few historians can claim to have undertaken historical analysis on as grand a scale as Geoffrey Parker in his 2013 work <EM>Global Crisis: War, Climate Change and Catastrophe in the Seventeenth Century</EM>. It is a doorstop of a book that surveys the ¿general crisis of the 17th century,¿ shows that it was experienced practically throughout the world, and was not merely a European phenomenon, and links it to the impact of climate change in the form of the advent of a cold period known as the ¿Little Ice Age.¿ </P><P>Parker¿s triumph is made possible by the deployment of formidable critical thinking skills ¿ reasoning, to construct an engaging overall argument from very disparate material, and analysis, to re-examine and understand the plethora of complex secondary sources on which his book is built. In critical thinking, analysis is all about understanding the features and structures of argument: how given reasons lead to conclusions, and what kinds of implicit reasons and assumptio