http://tierneylab.blogs.nytimes.com/2009/09/29/dr-holdrens-ice-age-tidal-wave/?_r=0
As a long-time student of John P. Holdren’s gloomy visions of the future, like his warnings about global famines and resource shortages, I can’t resist passing along another one that has just been dug up. This one was made in 1971, long before Dr. Holdren came President Obama’s science adviser, in an essay just unearthed by zombietime (a blog that has been republishing excerpts of his past writings). In the 1971 essay, “Overpopulation and the Potential for Ecocide,” Dr. Holdren and his co-author, the ecologist Paul Ehrlich, warned of a coming ice age.
They certainly weren’t the only scientists in the 1970s to warn of a coming ice age, but I can’t think of any others who were so creative in their catastrophizing. Although they noted that the greenhouse effect from rising emissions of carbon dioxide emissions could cause future warming of the planet, they concluded from the mid-century cooling trend that the consequences of human activities (like industrial soot, dust from farms, jet exhaust, urbanization and deforestation) were more likely to first cause an ice age. Dr. Holdren and Dr. Ehrlich wrote:
The effects of a new ice age on agriculture and the supportability of large human populations scarcely need elaboration here. Even more dramatic results are possible, however; for instance, a sudden outward slumping in the Antarctic ice cap, induced by added weight, could generate a tidal wave of proportions unprecedented in recorded history.
But that would just be the beginning. Dr. Holdren and Dr. Ehrlich continued:
If man survives the comparatively short-term threat of making the planet too cold, there is every indication he is quite capable of making it too warm not long thereafter. For the remaining major means of interference with the global heat balance is the release of energy from fossil and nuclear fuels. As pointed out previously, all this energy is ultimately degraded to heat. What are today scattered local effects of its disposition will in time, with the continued growth of population and energy consumption, give way to global warming. … Again, the exact form such consequences might take is unknown; the melting of the ice caps with a concomitant 150-foot increase in sea level might be one of them.
http://www.washingtontimes.com/news/2007/sep/19/inside-the-beltway-69748548/
NASA scientist James E. Hansen, who has publicly criticized the Bush administration for dragging its feet on climate change and labeled skeptics of man-made global warming as distracting “court jesters,” appears in a 1971 Washington Post article that warns of an impending ice age within 50 years.
“U.S. Scientist Sees New Ice Age Coming,” blares the headline of the July 9, 1971, article, which cautions readers that the world “could be as little as 50 or 60 years away from a disastrous new ice age, a leading atmospheric scientist predicts.”
The scientist was S.I.Rasool, a colleague of Mr. Hansen’s at the National Aeronautics and Space Administration. The article goes on to say that Mr. Rasool came to his chilling conclusions by resorting in part to a new computer program developed by Mr. Hansen that studied clouds above Venus.
The 1971 article, discovered this week by Washington resident John Lockwood while he was conducting related research at the Library of Congress, says that “in the next 50 years” — or by 2021 — fossil-fuel dust injected by man into the atmosphere “could screen out so much sunlight that the average temperature could drop by six degrees,” resulting in a buildup of “new glaciers that could eventually cover huge areas.”
If sustained over “several years, five to 10,” or so Mr. Rasool estimated, “such a temperature decrease could be sufficient to trigger an ice age.”
http://denisdutton.com/cooling_world.htm
There are ominous signs that the Earth’s weather patterns have begun to change dramatically and that these changes may portend a drastic decline in food production – with serious political implications for just about every nation on Earth. The drop in food output could begin quite soon, perhaps only 10 years from now. The regions destined to feel its impact are the great wheat-producing lands of Canada and the U.S.S.R. in the North, along with a number of marginally self-sufficient tropical areas – parts of India, Pakistan, Bangladesh, Indochina and Indonesia – where the growing season is dependent upon the rains brought by the monsoon.
The evidence in support of these predictions has now begun to accumulate so massively that meteorologists are hard-pressed to keep up with it. In England, farmers have seen their growing season decline by about two weeks since 1950, with a resultant overall loss in grain production estimated at up to 100,000 tons annually. During the same time, the average temperature around the equator has risen by a fraction of a degree – a fraction that in some areas can mean drought and desolation. Last April, in the most devastating outbreak of tornadoes ever recorded, 148 twisters killed more than 300 people and caused half a billion dollars’ worth of damage in 13 U.S. states.
To scientists, these seemingly disparate incidents represent the advance signs of fundamental changes in the world’s weather.
The central fact is that after three quarters of a century of extraordinarily mild conditions, the earth’s climate seems to be cooling down. Meteorologists disagree about the cause and extent of the cooling trend, as well as over its specific impact on local weather conditions. But they are almost unanimous in the view that the trend will reduce agricultural productivity for the rest of the century. If the climatic change is as profound as some of the pessimists fear, the resulting famines could be catastrophic. “A major climatic change would force economic and social adjustments on a worldwide scale,” warns a recent report by the National Academy of Sciences, “because the global patterns of food production and population that have evolved are implicitly dependent on the climate of the present century.”
A survey completed last year by Dr. Murray Mitchell of the National Oceanic and Atmospheric Administration reveals a drop of half a degree in average ground temperatures in the Northern Hemisphere between 1945 and 1968. According to George Kukla of Columbia University, satellite photos indicated a sudden, large increase in Northern Hemisphere snow cover in the winter of 1971-72. And a study released last month by two NOAA scientists notes that the amount of sunshine reaching the ground in the continental U.S. diminished by 1.3% between 1964 and 1972.
