7/09/2009

Time Magazine (1974): "Another Ice Age?"

They seemed so certain of this back in the mid1970s. This is from Time Magazine in 1974:

In Africa, drought continues for the sixth consecutive year, adding terribly to the toll of famine victims. During 1972 record rains in parts of the U.S., Pakistan and Japan caused some of the worst flooding in centuries. In Canada's wheat belt, a particularly chilly and rainy spring has delayed planting and may well bring a disappointingly small harvest. Rainy Britain, on the other hand, has suffered from uncharacteristic dry spells the past few springs. A series of unusually cold winters has gripped the American Far West, while New England and northern Europe have recently experienced the mildest winters within anyone's recollection.

As they review the bizarre and unpredictable weather pattern of the past several years, a growing number of scientists are beginning to suspect that many seemingly contradictory meteorological fluctuations are actually part of a global climatic upheaval. However widely the weather varies from place to place and time to time, when meteorologists take an average of temperatures around the globe they find that the atmosphere has been growing gradually cooler for the past three decades. The trend shows no indication of reversing. Climatological Cassandras are becoming increasingly apprehensive, for the weather aberrations they are studying may be the harbinger of another ice age.

Telltale signs are everywhere —from the unexpected persistence and thickness of pack ice in the waters around Iceland to the southward migration of a warmth-loving creature like the armadillo from the Midwest.Since the 1940s the mean global temperature has dropped about 2.7° F. Although that figure is at best an estimate, it is supported by other convincing data. When Climatologist George J. Kukla of Columbia University's Lamont-Doherty Geological Observatory and his wife Helena analyzed satellite weather data for the Northern Hemisphere, they found that the area of the ice and snow cover had suddenly increased by 12% in 1971 and the increase has persisted ever since. Areas of Baffin Island in the Canadian Arctic, for example, were once totally free of any snow in summer; now they are covered year round.

Scientists have found other indications of global cooling. For one thing there has been a noticeable expansion of the great belt of dry, high-altitude polar winds —the so-called circumpolar vortex—that sweep from west to east around the top and bottom of the world. Indeed it is the widening of this cap of cold air that is the immediate cause of Africa's drought. By blocking moisture-bearing equatorial winds and preventing them from bringing rainfall to the parched sub-Sahara region, as well as other drought-ridden areas stretching all the way from Central America to the Middle East and India, the polar winds have in effect caused the Sahara and other deserts to reach farther to the south. Paradoxically, the same vortex has created quite different weather quirks in the U.S. and other temperate zones. As the winds swirl around the globe, their southerly portions undulate like the bottom of a skirt. Cold air is pulled down across the Western U.S. and warm air is swept up to the Northeast. The collision of air masses of widely differing temperatures and humidity can create violent storms—the Midwest's recent rash of disastrous tornadoes, for example.

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4 Comments:

Blogger Proof said...

Well, whichever it is, John, it's certainly a crisis for which the government will have to act now and drastically!

7/10/2009 10:18 AM  
Blogger Mike Gallo said...

I remember in grade school, I read many of my parents' back-issues of National Geographic, starting in the 70's and all the way up to the current issues. I asked my dad about the change from talking about a new ice age to talking about out of control warming, and he didn't have any answers; he told me, however, to keep being critical of everything I read.

Now if only all these wackos had that sage advice in their heads.

7/10/2009 11:00 AM  
Blogger Paul_In_Houston said...

Proof said...

Well, whichever it is, John, it's certainly a crisis for which the government will have to act now and drastically!
.

And, of course, that means they mustn't waste time by actually reading any of the legislation; what with it being a crisis and all.

-

7/11/2009 12:52 AM  
Blogger Jeremy said...

You don't see the contradiction, there Proof? If now is the time to "act dramatically" then it's certainly important we understand what we need to act against.

2/10/2010 10:35 PM  

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