The Global Warming Challenge

Evidence-based forecasting for climate change

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Archive for the ‘media’ Category

Inquiry into global temperature data integrity announced

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The London-based think-tank the Global Warming Policy Foundation  announced on 26 April 2015 a major inquiry into the integrity of the official global surface temperature records. Questions have been raised about the reliability of the surface temperature data and the extent to which apparent warming trends may be artefacts of adjustments made after the data are collected.

The inquiry will review the technical challenges in accurately measuring surface temperature, and will assess whether the adjustments to the data are biased and, if so, to what effect. For more information, or to make a submission, see here.

Written by admin

April 27th, 2015 at 1:42 am

Where’s the warming, Al?

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The warming alarmist Met Office’s own figures, released without fanfare last week, show no global warming for 16 years. Does that mean we have had 16 years of “dangerous manmade global equilibrity”? Or should that be, 16 years of “beneficial manmade global temperateness”? Who’d have guessed? As readers of these pages will know, this is just what Kesten Green, Scott Armstrong, and Willie Soon found to be the best forecast of global mean temperatures in their paper titled “Validity of climate change forecasting for public policy decision making“: No change. This is also the forecast that Scott Armstrong has issued to challenge Al Gore’s forecast of alarming manmade warming. The Mail‘s article is here, and their temperature graph is below. Further discussion is provided by the Global Warming Policy Foundation, here.

Written by admin

October 16th, 2012 at 3:57 am

July: 2012 continues similar to 2011, cooler than 2010

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Despite some excitement about locally high temperatures, in the U.S. in particular, the average global temperature anomaly is, so far this year, much the same as 2011’s at 0.16°C compared to 0.15°C. Compared to 2010, with an annual average anomaly of 0.41°C, most of the world is experiencing a relatively cool year.

Written by admin

August 7th, 2012 at 8:56 am

Posted in global warming,media

Boxer and Armstrong Q&A

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The following is video of the Q&A portion of Examining Threats and Protections For the Polar Bear from January 30, 2008, between US Senator Barbara Boxer and Professor J. Scott Armstrong.
[vimeo 884050]

Written by climatebet

April 10th, 2008 at 11:38 pm

Posted in media

Senator Inhofe: Global Warming Alarmism Reaches A "Tipping Point"

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October 26, 2007: Senator Inhofe addresses the Senate floor for two hours on the tipping point of climate alarmism (full text| video clip 1 | video clip 2). Scott Armstrong’s Global Warming Challenge to Al Gore, along with the Green and Armstrong’s global warming paper (2007) were both mentioned when citing challenges to climate model accuracy:

Internationally known forecasting pioneer Dr. Scott Armstrong of the Ivy League University of Pennsylvania’s Wharton School, challenged Gore to a $10,000 bet in June over the accuracy of climate computer models predictions. Armstrong and his colleague Professor Kesten Green of the University of South Australia, found: “Claims that the Earth will get warmer have no more credence than saying that it will get colder.” According to Armstrong, the author of “Long-Range Forecasting,” the most frequently cited book on forecasting methods.: “Of 89 principles [of forecasting], the [UN] IPCC violated 72.”

Written by climatebet

October 26th, 2007 at 9:32 pm

Green and Armstrong Call for Scientific Forecasts of Sea Levels

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Dire consequences have been predicted to arise from the warming of the Earth in coming decades of the 21st Century. Enormous rises in sea level represent one of the more dramatic forecasts. A recent article provided sea-level forecasts based on experts’ judgments of what will happen. These judgments are in turn based on experts’ predictions of global warming. The article made no reference to scientific forecasts. As shown in Green and Armstrong (2007) experts’ forecasts have no validity in situations characterized by high complexity, high uncertainty, and poor feedback. Numerous other scientists also criticized this approach.

To date we are unaware of any forecasts of sea levels that adhere to proper (scientific) forecasting methodology and our quick search on Google Scholar came up short. If such forecasts are available, please provide citations and support as to their validity. As a first step, it would be useful to summarize studies that extrapolate long-term trends; this summary could provide a benchmark for comparison with other studies.

We will provide free access to them at and request commentary at Media outlets should be clear when they are reporting on scientific work and when they are reporting on the opinions held by some scientists. Without scientific support for their forecasting methods, the concerns of scientists should not be used as a basis for public policy.

Kesten Green and Scott Armstrong

Written by climatebet

September 27th, 2007 at 5:43 am

Armstrong's Congressional Briefing on YouTube

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Congressional Hearing 

A Congressional Briefing about forecasts of global warming given by Scott Armstrong on Thursday, Sept 13 is now available on YouTube (Part 2 and Part 3). The briefing was based on the Green & Armstrong paper, “Global Warming: Scientific Forecasts or Forecasts by Scientists?” The global warming paper is the first of what they hope will be many forecasting audits of global warming studies to be presented on the new Special Interest Group page at

Written by climatebet

September 16th, 2007 at 5:12 am