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All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.

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David Kirtley

I am not a scientist, but I've had a life-long interest in the sciences and in learning how the world works, from astronomy and geology to biology and evolution. When "climategate!" exploded on the internet in 2009, I was amazed at the mental hoops some people seemed to use to avoid understanding climate science. With a keen interest in making this complex subject matter easier for other "non-scientists" to understand, I joined the Skeptical Science team in 2013, helping out "behind the scenes" answering emails from readers, offering suggestions and editing blog posts. I live and work in St Louis, Missouri, USA.


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