Archive for the ‘j scott armstrong’ Category
Mostly down. In the course of the 72 months of the bet to date, the global mean temperature fell or remained flat compared to the previous month for 41 months, or 57% of the time. (In case you’re wondering, the UAH series records only 2 occasions over this period on which the temperature did not change from the previous month.)
We’re not sure how the ups-and-downs of the global temperature over these last six years accord with what Mr Gore had in mind when he issued his warning of an immanent and catastophic “tipping point”, but we know that his chances of winning the Climate Bet against the no-trend forecast proposed by Professor Armstrong have receded as the life of The Bet has progressed.
See the chart to the right with the latest (December 2013) data.
A summary of the critique of the use of complex mathematical models for forecasting long term climate change by Kesten Green, Scott Armstrong, and Willie Soon is published in the Nongovernmental Panel on Climate Change’s Climate Change Reconsidered II: Physical Science (2013).
The reference is as follows, and links to the relevant section and to the entire NIPCC report are available from the Global Warming Audit pages of the forecastingprinciples.com site, here.
Armstrong, J. S., & Green, K. C. (2013). Global climate models and their limitations: Model simulation and forecasting – Methods and principles. pp. 14-17 in Idso, C. D., Carter, R. M., & Singer, S. F. (Eds.), Climate Change Reconsidered II: Physical Science. Chicago, IL: The Heartland Institute.
With eleven months of temperature data now in for 2013, it is highly unlikely that Mr Gore could win this, the sixth, year of The Climate Bet. For Mr Gore to win, the December global mean temperature anomoly would need to be substantially higher than any month so far in The Bet. Failing that unlikely outcome, the no-change forecast that Professor Armstrong is betting on will have been more accurate that Mr Gore’s IPCC-originated dangerous manmade global warming forecast for five of the first six years of The Bet.
With October 2013′s global mean temperature data in, we now have 70 months of evidence on the accuracy of Mr Gore and the IPCC’s alarming warming forecast of temperatures increasing at a rate of 0.03ºC per annum. If Mr Gore’s forecast were valid and unbiased, we would expect actual temperatures to be higher than his forecast roughly half of the time and lower roughly half of the time. We checked the record of The Bet. It turns out that, to date, the actual global mean temperature has been higher than Mr Gore’s forecast less than one-quarter (23%) of the time. By contrast, the measured temperature has been warmer than the no-change benchmark, Professor Armstrong’s bet, 46% percent of the time; very close to the ideal of 50%. The updated chart is to the right.
“There are no scientific forecasts of dangerous global warming” shouts a new article in the Financial Post. Readers of this blog know that already, but will likely want to read what the op-ed titled “Climate forecast: All’s well, despite what the IPCC says” by Kesten Green, Scott Armstrong, and Willie Soon has to say about the implications for government policy. It has already attracted lively discussion. The article is here.
The authors claim to provide the only scientific forecast of long-term climate, namely the naive no-change or no-trend forecast that is the basis of Professor Armstrong’s notional bet with Mr Gore. The forecast was originally published in 2009, and the International Journal of Forecasting article can be found here. The authors’ current working paper investigating possible improvements to climate forecasting for policy makers is here.
The September global temperature anomaly was the highest it’s been since January, and is close to Mr Gore’s “forecast” for the month. The balance of the bet remains firmly in Professor Armstrong’s favour, however: The error of the red-hot alarmist projection is to date nearly 20% higher than the error from the scientific cool-green no-trend forecast. See the updated chart (color coded) and table to the right.
The Nongovernmental International Panel on Climate Change (NIPCC) has released a new report on the science of climate change: Climate Change Reconsidered II: Physical Science. The key takeaway messages are (1) the human impact on climate is very small and (2) any change in temperatures that might be occurring or will occur in the future is so small that it will not be noticed against the climate’s entirely natural variability.
As part of the NIPCC’s process for preparing this volume, scores of scientists from around the world evaluated the most up-to-date research on the physical science of climate change. This report is at least as comprehensive and authoritative as the reports of the United Nations-funded Intergovernmental Panel on Climate Change (IPCC) … and the NIPCC report is faithful to the scientific method. Whereas the mission of the IPCC is to find a human impact on climate change and thus justify government control of greenhouse gas emissions and our economy, the NIPCC has no agenda other than discovering the truth about climate change.
Section 1.1.1 of the report addresses forecasting principles and methods, and was co-authored by J Scott Armstrong and Kesten C Green. It is on p.14 of the Chapter 1 of the report, which is available here.
At 0.16°C, the August 2013 global average temperature anomaly is again below the no-change forecast of 0.208°C. For the 68 months of the bet now behind us, the average temperature has been equal to or below the no-change forecasts for 38 months or 56% of the time. For the latest data and chart on the Armstrong-Gore climate bet, click on the updated chart in the column to the right.
The Doctors for Disaster Preparedness Conference in Houston (July 12 to 15 2013) featured several talks related to the dangerous manmade global warming alarm, including one from theclimatebet.com’s Professor Scott Armstrong. A video of his talk, “Evidence-Based Forecasting for Global Warming”, is available here. Willie Soon’s talk, “Five or more failed experiments in measuring global sea level change”, is available here, and Antony Watts’s talk, “Ten tests to determine whether you should be concerned about global warming” is available here.
Scott Armstrong and Willie Soon both spoke on long-term climate forecasting—Armstrong on temperatures and Soon on sea levels—on 13 and 14 July 2014 at the Doctors for Disaster Preparedness Meeting in Houston, Texas. Scott Armstrong’s talk was titled “Evidence-based forecasting for global warming” and the slides are available here. Willie Soon’s talk was titled “Five or more failed experiments in measuring global sea level change” and a video recording of it is available, here.
Both scientists describe how alarming forecasts have been derived for these poorly understood situations using complex mathematical models with many variables and judgmental adjustments. These procedures violate The Golden Rule of Forecasting, which requires forecasters to be conservative, especially in the presence of great uncertainty.