Wednesday, April 15, 2009

Global Warming (And Cooling) Events Are Common

Dennis Avery, "environmental economist" and author, predicts the Earth is entering a cooling phase. He maintains that changes in solar activity are the primary cause of over 500 global warming periods during the past One Million years of Earth history. He disregards the popular concept of carbon dioxide (CO2) emissions causing global warming or climate change.

For more articles by Mr. Avery, search this blog. Note that he is also the co-author, with Dr. Fred Singer of the excellent book "Unstoppable Global Warming Every 1500 Years".

500 Warmings by Dennis Avery
Issue 129 - April 8, 2009 (source)
At the recent 2nd international conference of man-made warming skeptics sponsored by the Heartland Institute in New York, I predicted the earth’s warming/cooling trends for the 21st century.

I will be among splendid company such as John Coleman, founder of the weather channel, Ross McKitrick, who debunked the “hockey stick” study, physicist Willie Soon, and many other presenters with brilliant credentials. A thousand scientists, economists, and skeptics from every walk of life met to discuss the current climate indicators.

In my presentation, I used physical evidence of the more than 500 warmings in the past million years, which are found worldwide in ice cores, seabed sediments, fossil pollen and cave stalagmites. At least 700 scientists have published evidence on these solar-driven Dansgaared-Oeschger cycles. The good news is that the D-O cycle’s warmings have been getting somewhat cooler for the past 10,000 years—and there is no evidence that human-emitted CO2 will make them much warmer.

This means that the Modern Warming will probably remain cooler than the Medieval Warming (950-1300). It was 0.3 degrees warmer than the 20th century based on Craig Loehle’s study of 2000 years of temperature proxies. Willi Dansgaard’s 10,000-year reconstruction from ice cores shows the Roman Warming as warmer than the Medieval—but the two Holocene Warmings centered on 4,000 and 7,000 years ago were lots warmer than either.

The IPCC rejects the cycle evidence. They have concluded that the variability of the sun is “too small” to account for the earth’s recent warming 1976-98. They want us to sacrifice trillions of dollars to displace fossil fuels based on computers that couldn’t even predict the current cooling.
In contrast, I’ll predict a cooling planet for the next 25-30 years, because of the D-O cycle’s solar linkage. The sunspots began predicting cooling back in 2000, and it arrived a bit early, in 2007. CO2’s correlation with our temperatures over the past 150 years is only 22 percent. The correlation with sunspots is 79 percent—What does the UN think caused the 500 previous D-O cycles in the ice cores and seabed records?

There’s more. NASA, bless their hearts, reported last April that their Jason satellite confirms a cooling shift in the Pacific, our biggest heat sink. Roseanne D’Arrigo’s tree ring and rainfall proxies from around the Pacific Rim tell us that the earth’s temperatures have mirrored the Pacific’s cyclical shifts—in 25-40 year spurts—for at least the past 400 years.

I predict that after the current Pacific cooling is over, the earth will resume getting slowly and erratically warmer. But not much warmer. That’s because the D-O cycles are typically abrupt, delivering about half their temperature increase in the first few decades. Remember, we’ve had no significant net warming since 1940.

If the moderating trend in the global warming cycles persists, then we will get less than 0.5 degree C more warming over the next two centuries. If the Greenhouse Theory has any validity, we might get a bit more than 0.5 degree more warming—but not much. We tend to forget that the climate forcing power of CO2 unquestionably declines logarithmically, so the earth has probably already gotten three-fourths of the total.

As the earth cools, the U.S. will use our new natural gas surplus instead of biofuels, carbon taxes will die and the deliberate disruption of the economy will be stifled. Further warming 40 years from now will be too mild and erratic to renew public panic. Environmental assessments will become more realistic—and useful.

DENNIS T. AVERY is an environmental economist, and a senior fellow for the Hudson Institute in Washington, DC. He was formerly a senior analyst for the Department of State. He is co-author, with S. Fred Singer, of Unstoppable Global Warming Every 1500 Hundred Years, Readers may write him at PO Box 202, Churchville, VA 24421

Sources for this Article: Craig Loehle, “A 2000-year global temperature record based on non-tree ring proxies,” Energy and Environment 18 (7-8): 1059-1058 (2007); S. Johnson, W. Dansaard, et al., “Oxygen isotope profile through the Arctic and Greenland ice sheets, Nature, 235:429-454 (1972); Roseanne D’Arrigo et al., Tree-ring Estimates of Pacific Decadal Climate Variability” Climate Dynamics: Vol 18: 219-224, (2001).

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