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Climate Hustle

What were climate scientists predicting in the 1970s?

What the science says...

Select a level... Basic Intermediate

The vast majority of climate papers in the 1970s predicted warming.

Climate Myth...

Ice age predicted in the 70s
"[M]any publications now claiming the world is on the brink of a global warming disaster said the same about an impending ice age – just 30 years ago. Several major ones, including The New York Times, Time magazine and Newsweek, have reported on three or even four different climate shifts since 1895." (Fire and Ice)

In the thirty years leading up to the 1970s, available temperature recordings suggested that there was a cooling trend. As a result some scientists suggested that the current inter-glacial period could rapidly draw to a close, which might result in the Earth plunging into a new ice age over the next few centuries. This idea could have been reinforced by the knowledge that the smog that climatologists call ‘aerosols’ – emitted by human activities into the atmosphere – also caused cooling. In fact, as temperature recording has improved in coverage, it’s become apparent that the cooling trend was most pronounced in northern land areas and that global temperature trends were in fact relatively steady during the period prior to 1970.

At the same time as some scientists were suggesting we might be facing another ice age, a greater number published contradicting studies. Their papers showed that the growing amount of greenhouse gasses that humans were putting into the atmosphere would cause much greater warming – warming that would exert a much greater influence on global temperature than any possible natural or human-caused cooling effects.

By 1980 the predictions about ice ages had ceased, due to the overwhelming evidence contained in an increasing number of reports that warned of global warming. Unfortunately, the small number of predictions of an ice age appeared to be much more interesting than those of global warming, so it was those sensational 'Ice Age' stories in the press that so many people tend to remember.

The fact is that around 1970 there were 6 times as many scientists predicting a warming rather than a cooling planet. Today, with 30+years more data to analyse, we've reached a clear scientific consensus: 97% of working climate scientists agree with the view that human beings are causing global warming.

Basic rebuttal written by John Russell

Update July 2015:

Here is a related lecture-video from Denial101x - Making Sense of Climate Science Denial


Last updated on 5 July 2015 by pattimer. View Archives

Printable Version  |  Offline PDF Version  |  Link to this page

Further reading

Further viewing

"In the 70s, They said there'd be an Ice Age" from Climate Denial Crock of the Week.


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Comments 51 to 68 out of 68:

  1. I still haven't found a way to list the various questions that I've touched on this site.

    When I refer to 'ice age' I'm talking about the ice ages that occur on the 100,000 year period, as revealed by the ice core data.

    Chris Shaker

    [DB] Read this post:  Milankovitch Cycles

  2. Dikran:

    I would appreciate very much knowing how I can look at my own posting history. So far, I do not see any way to access my own posting history to see what questions I have posted under. It does not appear that Google is allowed to index the comments under the questions on this website?

    Thank you,
    Chris Shaker

    Dikran Marsupial said at 21:33 PM on 23 October, 2011
    CBDunkerson I have just looked into cjshaker's posting history, and it appears that he asks many questions, but rarely replies to the answers.

    [DB] I'm not sure if you can access this link, but your posting history can be found here.

  3. Dikran:

    Thank you very much for the link! Works like a champ for me.

    Chris Shaker
  4. I just ran across this paper, (Damon & kunen 1976) "Global Cooling?"

    In the abstract is the following:

    Because of the rapid diffusion of CO2 molecules within the atmosphere, both hemispheres will be subject to warming due to the atmospheric (greenhouse) effect as the CO2 content of the atmosphere builds up from the combustion of fossil fuels. Because of the differential effects of the two major sources of atmospheric pollution, the CO2 greenhouse effect warming trend should first become evident in the Southern Hemisphere. The socioeconomic and political consequences of climate change are profound.

    Science 6 August 1976:
    Vol. 193 no. 4252 pp. 447-453
    DOI: 10.1126/science.193.4252.447
    Global Cooling?

    It seems that not only was the consensus recognizing global warming, but there was a warning with respect to socioeconomic and political consequences.
  5. Bad news John/Dana/whoever is responsible for this page--the link to the video is dead. Maybe replace it with potholer54's video here

  6. Please correct the caption to figure 1

    Figure 1: Number of papers classified as predicting global cooling (blue) or warming (red). In no year were there more cooling papers than warming papers (Peterson 2008).

    Of these 15 years, 14 had more warming than cooling papers

    Looking at the data on the bar graph it appears that there is one year (1971) in which there were 2 cooling papers to the single warming paper.  

    It may be insignificant, but it is an error.  A suggested correction.

  7. Peter Gwynne, the author of the referenced Newsweek article from 1975, recently published the article "My 1975 'Cooling World' Story Doesn't Make Today's Climate Scientists Wrong" which is well worth a read.

  8. Does anyone have a link to the Scientific American article from the 1950s (or 60s?) called "Carbon Dioxide and Climate". So far I have seen only the attached rather blurred scan. I would like to read it (and find out the date!)


    SciAm article from the 1950s on climate change


    [PS] Fixed image size

  9. This looks to be the G Plaas paper. You can find references and links to these early papers here including this one. See also the wonderful Weart book "The discovery of global warming".

    For the sciam reference, see here. A republish of july 1959 article.

    Note that this is offtopic. Please do not continue discussion in this thread.

  10. LizR @58, Scientific American republished that article in 2008 "to offer an historical perspective on some of the issues being discussed at the United Nations Framework Climate Change Conference".  The full original version including charts and illustrations has also been reproduced as a PDF here.

  11. The "most cited" 1970's article heading this SkS post does contain a grown-up bit of referencing that I don't see discussed in the comment thread here. The 1975 Newsweek article "The Cooling World" quotes from "a recent report by the National Acadamy of Sciences" which is the 1975 report by the Panel on Climatic Variation "Understanding Climatic Change: A Program for Action". This long report (a transcript of sorts here) is certainly not about global cooling but about the threat from any form of climate change.

    Beyond that basic conclusion, the report does strangely pull its punches when it comes to CO2 emissions, even though CO2 is the first man-made impact to be listed and its impacts are then enumerated.

    The corresponding changes of mean atmospheric temperature due to C0 2 [as calculated by Manabe (1971) on the assumption of constant relative humidity and fixed cloudiness] are about 0.3 °C per 10 percent change of C0 2 and appear capable of accounting for only a fraction of the observed warming of the earth between 1880 and 1940. They could, however, conceivably aggregate to a further warming of about 0.5 °C between now and the end of the century.

    Yet the message that CO2 presents a threat is somehow lost, with the 'Program for Action' calling for research into climate rather than a reduction of CO2 emissions. Somehow the stark message of the Charney Report just four years later is absent, such conclusions overwhelmed by talk of other human impacts. The report gets bogged down with the likes of the theoretical potential of aerosol cooling (that "cannot be reliably determined from present information") becoming more important in future:-

    Of the two forms of pollution, the carbon dioxide increase is probably the more influential at the present time in changing temperatures near the earth's surface (Mitchell, 1973a). If both the C0 2 and particulate inputs to the atmosphere grow at equal rates in the future, the widely differing atmospheric residence times of the two pollutants means that the particulate effect will grow in importance relative to that of C0 2 .

    And the impact of waste heat (which logically could be a big problem if fossil fuels were replaced by thermally inefficient nuclear power) is considered along with other various albedo effects, all competing with the CO2 message.

    Yet, there are certainly no predictions of a "cooling world", no ice age being predicted here. Rather, the message is that climate change is dangerous.

  12. What happens when we take this article's opening statement, "1970s ice age predictions were predominantly media based", and apply it to today's climate debate? Let's see:

    "Climate change fears (ice age predictions) of the early 21st century (1970s) were predominantly media based." 

    Is that not an accurate statement? The public's perception of climate change in the modern era has been shaped by the media, not science. Of the millions of people who think they're saving the planet by driving a Prius, only a tiny fraction, far less than 1%, have actually taken the time to review actual scientific data on the topic. They don't know what the term 'greenhouse gas' actually means, nor do they care to. (They also don't know that the Nickel in their beloved Prius's batteries was extracted though mining operations that are more polluting than almost any other human activity).

    The media shaped public opinion on climate in the 1970s just like it does today. 

  13. No, Kabothpa, it is not an accurate statement. You seem to have neglected "science" in your comment: the '70s predictions were almost entirely media, with little science, while today there is a very strong science foundation reagarding future warming.

    You have played "bait and switch" (perhaps not intentionally) by first discussing a general statement about the 1970s ice age predictions, and finishing with a statement about media shaping public opinion. How public opion is shaped is not a discussion about the scientific position, and the 1970s scientific position on cooling (extremely limited support) is not at all like the current scientific position on CO2-caused warming (very strongly supported).

  14. Recommended supplemental reading:

    My 1975 'Cooling World' Story Doesn't Make Today's Climate Scientists Wrong

    It's time for deniers of human-caused global warming to stop using an old magazine story against climate scientists.

    by Peter Gwynne, Inside Science, May 21, 2014

  15. "The fact is that around 1970 there were 6 times as many scientists predicting a warming rather than a cooling planet"Following is a link to 93 papers concerned about an imminent ice age in the 1970's. the moderator either rebut these 93 or provide 6 times as many "warming" papers from the 1970's?
  16. Bruce:

    From the first reference at your link (Hanson et al 1981)

    "Summary. The global temperature rose by 0.20C between the middle 1960's and 1980, yielding a warming of 0.4°C in the past century. This temperature increase is consistent with the calculated greenhouse effect due to measured increases of atmospheric carbon dioxide. Variations of volcanic aerosols and possibly solar luminosity appear to be primary causes of observed fluctuations about the mean trend of increasing temperature. It is shown that the anthropogenic carbon dioxide warming should emerge from the noise level of natural climate variability by the end of the century, and there is a high probability of warming in the 1980's. Potential effects on climate in the 21st century include the creation of drought-prone regions in North America and central Asia as part of a shifting of climatic zones, erosion of the West Antarctic ice sheet with a consequent worldwide rise in sea level, and opening of the fabled Northwest Passage." (my emphasis)

    Hardly in support of global cooling.  The second reference: Benton 1970 also predicts global warming with increasing carbon dioxide.  After the first two I stopped checking.

    When you cite papers that predict additional warming and say that they support claims of global cooling it is easy to get a lot of papers.  Scientists read the citations and realize that the claims of predictions of global cooling rely on readers who do not check the citations.

  17. Just like Michael Sweet says.

    Bruce @65 . . . . what, if any, is the point you are wishing to make?

    Have you read any of the alleged 93 papers?  It would be wise of you to read at least a small sample of those papers to see if they were really "concerned".   Be wise of you, because Notrickzone is a notorious Fake News outlet, which spouts an amazingly-large amount of BS on all sorts of topics and seems to enjoy winding-up gullible & ignorant readers.  (Presumably that's how they make their money at the website.)

    That's not to say that it ain't (just) possible that the Notrickszoners might actually have published something truthful this time [gotta be a first time for them, sometime, right?] . . . but judging by their track record, they usually only prefer to to tell a truth is it's a half-truth which misleads or misdirects the gullible readers.  So be on your guard, Bruce !!   And do a bit of cross-checking.

    Now, back to the Notrickszone message.

    And the first question is : So what?   Bruce, read the brief article above [by John Russell] and view the 5-minute video by David Bedford.  And look at the [1914] report mentioned in post #64 just above your own post #65.

    Look again at the reality, Bruce : the globe is warming rapidly; sea level is rising ever faster; the world's ice is melting rapidly decade by decade. (Not many glaciers left in Glacier National Park now, Bruce.  Sad. )    And the world has just had its 4 hottest years on record ( 2014 / 2015 / 2016 / and 2017 is in the bag ! )

    And it's gonna get hotter still — as said by virtually all the scientists who know what's what.   There's no reason left to believe any of the BS coming from the science-deniers (or from Notrickszoners, either).   Look around, Bruce — unlike in the 1970's , there are nowadays no credible scientists remaining, who think Global Warming ain't happening.

    And all the climate scientists have got the evidence backing their opinion !!

    So, Bruce, what do you think?   (Forget the Notrickszone rubbish/spin.)

  18. Typo correction : that should read "... look at the [2014] report mentioned in post #64 ..."

    Only clairvoyants in 1914, could perceive a 1975 'Cooling World' Story !

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