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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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	Climate's changed before
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Climate Misinformation by Source: John Christy

Dr. John Christy is a Professor of Atmospheric Science and Director of the Earth System Science Center at the University of Alabama in Huntsville (UAH). He has also been Alabama's State Climatologist since November 2000. He is mostly known for his work with the satellite-based temperature monitoring for which he and Dr. Roy Spencer received NASA’s Exceptional Scientific Achievement Medal. Christy helped draft and signed the 2003 American Geophysical Union statement on climate change [Source: Wikipedia].

Dr. Christy believes that the climate system is quite insensitive to humanity’s greenhouse gas emissions and doubts that human activity is to blame for most of the observed recent warming.

Other professional affiliations: Dr. Christy is listed as a "Roundtable Speaker" for the George C. Marshall Institute, a right-wing conservative think tank on scientific issues and public policy. He is also listed as an expert for the Heartland Institute, a libertarian American public policy think tank [Source: DeSmogBlog]

Articles

Written Statement of John R. Christy, Subcommittee on Energy and Power

URL: http://republicans.energycommerce.house.gov/Media/file/Hearings/Energy...
Date: 9 March 2011

Arguments by Christy	vs	What the Science Says
"Climate sensitivity is low"		Net positive feedback is confirmed by many different lines of evidence.
"CO2 limits will make little difference"		If every nation agrees to limit CO2 emissions, we can achieve significant cuts on a global scale.
"Extreme weather isn't caused by global warming"		Extreme weather events are being made more frequent and worse by global warming.
"It's microsite influences"		Microsite influences on temperature changes are minimal; good and bad sites show the same trend.
"It's Urban Heat Island effect"		Urban and rural regions show the same warming trend.
"Models are unreliable"		Models successfully reproduce temperatures since 1900 globally, by land, in the air and the ocean.
"Satellites show no warming in the troposphere"		The most recent satellite data show that the earth as a whole is warming.
"There's no tropospheric hot spot"		We see a clear "short-term hot spot" - there's various evidence for a "long-term hot spot".

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