The Global Warming Challenge

Evidence-based forecasting for climate change

Archive for June 2007

Auditing Public Policy Forecasting: Climate Change, Gun Control, and Other Issues

leave a comment »

International Symposium on Forecasting

At one of the concluding sessions of the 27th Annual International Symposium on Forecasting (ISF) titled “Auditing Public Policy Forecasting: Climate Change, Gun Control, and Other Issues”, Scott Armstrong, Paul Goodwin, and John Lott each gave presentations during the hour-long session. Below is information on the speakers as well as talk summaries.

Scott Armstrong on Climate Change
Professor of Marketing, University of Pennsylvania
International Symposium on Forecasting

Click for a brief video of Armstrong’s talk.

Presented his and Kesten Green’s findings from the paper, “Global Warming: Forecasts by Scientists Versus Scientific Forecasts,” where they applied forecasting principles to Section 8 of the 2007 IPCC report, revealing that scientists did not adhere to proper forecasting procedure. These critical violations of forecasting principles led them to conclude that they have been unable to identify scientific forecasts to support global warming. The presentation concluded with an explanation of the challenge to Al Gore, as well as

Paul Goodwin on Business Forecasting
Professor of Management Science, University of Bath (UK)
International Symposium on Forecasting
How do models fit in with business forecasting? Goodwin explained how the use of ‘the system’ and high-tech software analytics creates models that are merely used to support desired forecasts, instead of the back-and-forth relationship that should exist between models and forecasters’ interests. He left the audience with the question: in a world where billions of dollars are at stake, how to firms stay afloat if they only see what they want to see?

John Lott on Gun Control
Senior Research Scientist, University of Maryland
International Symposium on Forecasting
Controversial economist John Lott concluded the session by highlighting the strength of emotion against the facts, present in most major public policy debates. His issue? Gun control. Lott explained why we are much more likely to see violent gun crimes in the mass media, and why we rarely hear of the use of guns in self-defense or to ward off criminals. Though the first is much more memorable, the latter is far more common. These facts must be used when making public policy decisions that are emotionally charged.

The session concluded with questions and discussion, as well as this impromptu photo of Armstrong and Trenberth encouraging scientists to facilitate discussion across opinions:
International Symposium on Forecasting

Written by climatebet

June 28, 2007 at 2:08 pm

Dr. Kevin Trenberth, Keynote Presentation at ISF ‘07

with one comment

Dr. Kevin Trenberth, Head of the Climate Analysis Section at the National Center for Atmospheric Research, gave a keynote presentation June 26th, 2007, at the 27th International Symposium for Forecasting. He was a lead author of the 1995, 2001, and 2007 Intergovernmental Panels on Climate Change (IPCC) Scientific Assessment of Climate Change. For a full list of credentials, please visit Dr. Trenberth’s homepage.

Trenberth’s keynote presentation was titled Climate and weather forecasting: Issues and prospects for prediction of climate on multiple time scales. His full presentation is available at his website. The following is an abstract excerpt:

In contrast to weather, which involves the evolution of the atmosphere, climate involves the entire climate system and its forcings. The climate system includes the atmosphere and oceans as fluid components, and all aspects of the land surface including vegetation and hydrology, and the cryosphere. The forcings include influences external to the climate system, such as the sun or human activities. While prediction of the atmosphere is inherently limited by chaotic developments, its systematic interaction with other components of the climate system and forcings enables patterns or the statistics of atmospheric behavior to have some predictability.

Read the rest of this entry »

Written by climatebet

June 27, 2007 at 2:42 am

Counting the Days

with 5 comments

Updated: Gore’s office responded on Thursday, June 28th, 2007.

See this post for more details.

Written by climatebet

June 26, 2007 at 11:54 am

Put your money where your ‘myth’ is

leave a comment »

“Meet the Ivy League professor and expert on forecasting who is challenging Al Gore to a $20,000 bet that he is wrong on global warming.

This Monday June 25th, 2007, the article “Put your money where your ‘myth’ is” by Brendan O’Neill was featured on, an online magazine with a global and critically minded readership. Armstrong was interviewed for the article by O’Neill. Read on for two excerpts from the article.

Read the rest of this entry »

Written by climatebet

June 26, 2007 at 2:57 am

Letter to Al Gore

with 3 comments

Tuesday afternoon, June 19th, 2007, a letter with the terms of the challenge attached was both faxed and mailed to Al Gore. The full contents of the letter are published below:

June 19, 2007

Honorable Albert Gore
2100 West End Avenue
Suite 620
Nashville, TN 37203

Fax: 615-327-2227

Dear Mr. Gore,

A “Global Warming Challenge” is attached. I think the challenge serves our mutual interest in developing better public policy. The terms of the challenge can be easily changed upon mutual agreement.

The primary objective is to improve the application of scientific methods in forecasting climate change and, thus, to use better forecasting methods. In addition, it may provide funding for one of our charities.

The objectives are attainable no matter which of us would “win” the challenge. The fact that we would be joining together in this challenge should draw the attention of scientists to the need for using the best forecasting methods and conducting proper validation tests.

Might you be able to respond by the time of my International Symposium on Forecasting talk on the morning of Wednesday June 27? This could be something as simple as “accept,” “decline,” or “contemplating.” Or it could be a longer response. You, or one of your representatives would be welcome, of course, to be a guest at this conference.

I believe that you already know the chairperson, Kajal Lahiri, from his days in Arlington when your sons played on the same soccer team. If you can attend, Kajal will make provisions for you to respond to this challenge. The conference runs from Monday through mid-day Wednesday.

Would you be interested in receiving a copy of my Principles of Forecasting book? I will be happy to send you a copy if you tell me what address to use.


J. Scott Armstrong

Professor of Marketing
The Wharton School
University of Pennsylvania
Philadelphia, PA 19104
armstrong at wharton dot upenn dot edu

Written by climatebet

June 22, 2007 at 4:23 pm

Front Page Daily Pennsylvanian

leave a comment »

Today, the University of Pennsylvania newspaper “The Daily Pennsylvanian” covered Armstrong’s challenge on the front page (pdf). Click here to view the online version of “An Inconvenient Bet?”

Of note in the article is the author’s interview of an MIT climate scientist:

Carl Wunsch, a professor of physical oceanography and climate-change expert at the Massachusetts Institute of Technology, said that though different forecasting models show different outcomes for the planet as a result of global warming, most which are taken seriously by climate-change experts do show the world overall becoming warming and wetter because of human activity.

“They should be regarded as possibilities … that need to be taken seriously,” he said.

Wunsch also questioned whether someone who is admittedly unversed in the scientific principles of meteorology and geology could provide a better forecasting model than experts in these fields.

Written by climatebet

June 21, 2007 at 5:06 pm

Want to take part in the challenge?

leave a comment »

“Hopefully other competitors would join to show the value of their forecasting methods.”

As stated in the terms, we are actively looking for other participants to take part in the challenge. All will be documented right here at for our readers. Maybe you think you can do better than Armstrong or Gore.

Have a model you wish to have tracked? Interested in promoting the proper use of science in formulating public policy?

Send Scott Armstrong an email: armstrong at wharton dot upenn dot edu.

Written by climatebet

June 20, 2007 at 12:59 pm

Posted in the challenge