Published: Friday, June 15, 2007
In the 1970s, leading scientists claimed that the world was threatened by an era of global cooling.
Based on what we've learned this decade, says George Kukla, those scientists - and he was among them -- had it right. The world is about to enter another Ice Age.
Dr. Kukla, in 1972 a member of the Czechoslovakian Academy of Sciences and a
pioneer in the field of astronomical forcing, became a central figure in
Later that year, Drs. Kukla and Matthews highlighted the dangers of global cooling in Science magazine and, because of the urgency of the matter, in December they also alerted President Richard Nixon in a joint letter. The conference had reached a consensus, their letter stated, that "a global deterioration of climate, by order of magnitude larger than any hitherto experienced by civilized mankind, is a very real possibility and indeed may be due very soon. The cooling has natural cause and falls within the rank of processes which produced the last ice age."
The White House reacted swiftly to the letter, which described
"substantially lowered food production" and "extreme weather
anomalies," such as killer frosts and floods, as well as a warning that
Soon, numerous other government agencies were drawn in -- the issue was seen to be of paramount importance -- and by 1974, a federal government report, A United States Climate Program, cited evidence of the gathering storm, including:
"A killing winter freeze, followed by a severe summer heat wave in the
"Drought in the Soviet Union producing a 12% shortfall in their grain production in 1972, forcing the country to purchase grain abroad, which in turn reduced world grain reserves and helped drive up food prices.
"Collapse of the Peruvian anchovy harvest in late 1972 and early 1973, related to fluctuations in the Pacific Ocean currents and atmospheric circulation, impacted world supplies of fertilizer, the soybean market and prices of other protein feed stocks.
"The anomalously low precipitation in the U.S. Pacific Northwest during the winter of 1972-73 depleted water-reservoir storage by an amount equivalent to an amount of water required to generate more than 7% of the electric energy for the region."
By 1975, the first of numerous bills, such as the "National Climate
Program Act of 1975," was introduced to establish a co-ordinated national
program of climate research, monitoring, prediction and contingency-planning
analysis. Much congressional testimony spoke of the inadequacy of climate
research and the need for preparedness. Meanwhile, the failure of the Soviet
Union's wheat crop (and a subsequent high-profile
Many today speak with derision of the 1970s global-cooling scare, seeing it as a cautionary false alarm. Others see it as an embarrassment -- Newsweek magazine, which published a 1975 article entitled "The Cooling World," even corrected the record with a 2006 follow-up to its 1975 article arguing that scientists now have it right.
Dr. Kukla sees it -- and the 1975 Newsweek article -- differently. Although the magazine article indicated that the cooling trend would be continuous, scientists knew otherwise. "None of us expected uninterrupted continuation of the trend," he states. Moreover, thanks to new evidence that Dr. Kukla only recently published, he now knows that global warming always precedes an ice age. That makes the current period of global warming a mere blip that constitutes additional indication of the ice age to come.
To Dr. Kukla, the fundamental issue here could not be more clear. For millions of years, the geologic record shows, Earth has experienced an ongoing cycle of ice ages, each typically lasting about 100,000 years, and each punctuated by briefer, warmer periods called interglacials, such as the one we are now in. This ongoing cycle closely matches cyclic variations in Earth's orbit around the sun.
"I feel we're on pretty solid ground in interpreting orbit around the sun as the primary driving force behind ice-age glaciation. The relationship is just too clear and consistent to allow reasonable doubt," Dr. Kukla said. "It's either that, or climate drives orbit, and that just doesn't make sense."
--- - Lawrence Solomon is executive director of Urban Renaissance Institute and Consumer Policy Institute, divisions of Energy Probe Research Foundation. www.urban-renaissance.org.
CV OF A DENIER:
George Kukla, micropalentologist and Special Research Scientist at the
Lamont-Doherty Earth Observatory of Columbia University, is a pioneer in the
study of solar forcing of climate changes. He was the lead author of the
scientific paper that first supported Milutin Milankovic's theory of glacial
cycles by investigating the stratigraphy in deep-sea sediment cores from the