The Global Warming Challenge

Evidence-based forecasting for climate change

Archive for the ‘j scott armstrong’ Category

86 months on, and still no “tipping point”

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With 86 months of the 120 month Climate Bet behind us, we are still waiting for the “tipping  point” Mr Gore promised us. We hope you haven’t been holding your breath, or planted bananas in your wheat field. While the actual temperature has been cooler than Professor Armstrong’ no-change forecasts for more than half of all bet months (51%), the Gore-IPCC forecasts ran hotter than the actual temperature for 81% of months to date.

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March 11th, 2015 at 11:41 am

January 2015 warms Mr Gore’s prospects

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The global average average temperature anomaly ticked up a tad to reach 0.36°C in January, enough to get past half-way to the IPCC “dangerous warming” trend line that is standing in for Mr Gore’s bet. Mr Gore has now won 26 out of the 85 months of The Climate Bet so far; less than half of the 59 months that Professor Armstrong has won. We hope that Mr Gore wins a few more months to keep The Bet alive for the remaining nearly three years that are left to run.

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February 11th, 2015 at 12:17 pm

Who is more accurate, the global coolers or the global warmers?

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Kesten Green and Scott Armstrong tested the predictive validity of the United Nations’ IPCC global warming hypothesis of +0.03°C per year due to increasing CO2 against the relatively conservative hypothesis of natural global cooling at a rate of -0.01°C per year. The errors of forecasts from the global warming hypothesis for horizons 11 to 100 years ahead over the period 1851 to 1975 were nearly four times larger than those from the global cooling hypothesis.

Forecasts from the no-change model, however, were substantially more accurate again than those from the global cooling hypothesis. Findings from their tests covering a period of nearly 2,000 years support the predictive validity of the no-change hypothesis for horizons from one year to centuries ahead (Green and Armstrong, 2014). A pre-publication draft of their “Forecasting global climate change” chapter is available, here.

Green, K. C. & Armstrong, J. S. (2014). Forecasting global climate change. In Moran, Alan (ed.). Climate Change: The Facts 2014, pages 170-186. Published by the Institute of Public Affairs, Melbourne, Victoria 3000, Australia.

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January 28th, 2015 at 3:02 am

Global temperatures: Seven years of Sideways

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It may be hard to believe with the rhetorical bombardment of the warming alarmists and their supporters in the media that we are exposed to, but global average temperatures over the last seven years averaged less than the 2007 base year of the Armstrong-Gore bet. Yes, you did just read that!

The average of the monthly temperature anomalies in 2007—as calculated by the University of Alabama at Huntsville scientists from satellite observations—was 0.21°C. The average for the seven years since then was 0.20°C.

That doesn’t seem like a tipping point, Mr Gore!

The updated graph, to the right, shows not a tipping point, but lots of turning points. The net result? You guessed it, a sideways drift that is just what followers of this site and the evidence-based Green, Armstrong, and Soon no-trend forecast would expect.

New Book “Climate Change: The Facts 2014″

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The Institute of Public Affairs have published a collection of works on the physics, economics, and the politics of climate change (a.k.a. the alarm that dangerous manmade global warming is and will continue to occur.) The 21 chapters by leading researchers and commentators include Willie Soon’s “Sun shunned”, and Kesten Green and Scott Armstrong’s “Forecasting global climate change”. The book is available, here. We suggest sending Mr Gore a copy.

Update: Kindle versions of Climate Change: The Facts 2014 are now available on Amazon. Either search for the title or click the link to the book on your country’s Amazon site from the following list: US, UK, CA, AU, DE, FR, ES, IT, NL, JP, BR, MX, IN.

IUCN finds polar bear scientists’ models unsuitable for population prediction

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We imagine that Barbara Boxer will be particularly pleased that she did not respond to Professor Armstrong’s 2008 challenge to back her belief that the polar bear population was threatened with rapid decline by accepting his bet, based on scientific forecasting in Armstrong, Green, and Soon (2008), that polar bear numbers would remain at current levels or better.

It seems that modellers at the International Union for the Conservation of Nature agree with Armstrong, Green, and Soon that the models of polar bear biologist Steven Amstrup and colleagues, upon which Senator Boxer based her belief, are not fit for the purpose of forecasting the polar bear population. For more on this story see the article titled “Amstrup knows his polar bear predictions are flawed – but continues to promote them” on the site, here.

Are forecasts of a 2014 global temperature record believable?

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Based on NOAA figures for August 2014, Discover magazine posted an article online on September 19 with a headline making a dramatic forecast that, “With Summer’s Unequalled Warmth, 2014 is Likely to Finish as the Warmest Year on Record for the Home Planet“. AOL ran a piece on October 20 making the same forecast, this time backed with an extra month of NOAA data and the support of a claim by a NOAA scientist that “it’s pretty likely” that 2014 will see the global average temperature record broken… for the years since records began in 1880.

Climate scientist Roy Spencer begs to differ in his blog post titled “Why 2014 won’t be the warmest year on record“. Dr Spencer prefers the UAH satellite data record, pointing out that it, as opposed to NOAA’s adjusted and patchy thermometer data series, the satellite data provides a truly global and objective measure of temperatures. The Global Warming Challenge uses the UAH series as the measure for determining who will win the Armstrong-Gore bet for that reason.

We will post the outcome of the Spencer-NOAA conflicting forecasts when the data are finalised early in 2015.

Gore bet looks vulnerable with less than one-third to run

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The September 2014 data showed a small lift in the global mean temperature to an anomaly of 0.3°C. Still a win for the month to Professor Armstrong and the Green, Armstrong, and Soon no-change forecast, temperatures have been cooler than Mr Gore and the IPCC’s alarming projection for 20 months in a row. Overall, global mean temperatures have come in cooler than the alarmist projection 80 percent of the time since the beginning of the bet nearly seven years ago.

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October 22nd, 2014 at 6:35 am

August 2014 fails to warm

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We’ve updated the Climate Bet graph on the right with the global average temperature for August. The picture seems clear to us: there is no trend. Not surprisingly then, the projected 0.03°C per year increase that the IPCC and Mr Gore (who expected a tipping point and dangerously warming temperatures) thought was likely on the low side has been equaled or exceeded only sixteen times in the 80 month life of the bet, so far. In contrast, monthly temperatures have come in lower than Professor Armstrong’s bet on no-change for 55% of months.

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September 9th, 2014 at 4:47 am

Mr Gore’s tipping point forecast either biased, or very unlucky

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Since we started monitoring the Gore-Armstrong bet back in 2008, global mean temperatures have only rarely been as warm or warmer than Mr Gore and the IPCC’s +0.03 °C per year warming forecast would have had us believe. How rarely? Well, roughly one-month-in-five, or 21% of the 77 months to date. As we’ve pointed out before, one would expect the figure to be 50% if the Gore/IPCC forecasts were unbiased. Mr Gore must be very unlucky, because the chances that so few months would turn out to be as warm or warmer than unbiased forecasts is less than one-in-eight-million.

But wait, Mr Gore and the IPCC warned us that there was more chance that temperatures would be higher than their forecasts, than that they would be lower. In other words, they claimed their forecasts were biased toward slower warming than the rapid warming they really believed would occur. We haven’t calculated the vanishingly small odds that global temperatures would turn out to be so uninclined to warm taking into account the declared downward bias in their forecasts, but we suspect that Mr Gore and the IPCC have been feeling that the Earth has let them down.

For keen followers, the latest month of The Bet, May 2014, is shown in the chart on the right.

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June 16th, 2014 at 2:41 am