OK...One last time
Mr Hansen was not responsible for the article you seem to be using as a source....OK? It all goes back to a NYTimes article highlighting a hypothesis outlined in a science journal. The author used a climate model developed by hansen to study the clouds of VENUS, for part of the data he used to develop the hypothesis.
Quote:
The Post archives do indeed identify the existence of such a
piece, with the following preview:
The world could be as little as 50 or 60 years away from a
disastrous new ice age, a leading atmospheric scientist predicts.
Dr. S. I. Rasool of the National Aeronautics and Space
Administration and Columbia University says that...
The Times piece continued:
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."
It turns out the Post was referring specifically to an article
published at the journal Science that day, which was written by
Rasool and S. H. Schneider.
Science archives identified the following abstract of the piece
entitled "Atmospheric Carbon Dioxide and Aerosols: Effects of
Large Increases on Global Climate," and indicated the authors
were from "Institute for Space Studies, Goddard Space Flight
Center, National Aeronautics and Space Administration" (emphasis
added):
Effects on the global temperature of large increases in carbon
dioxide and aerosol densities in the atmosphere of Earth have
been computed. It is found that, although the addition of carbon
dioxide in the atmosphere does increase the surface temperature,
the rate of temperature increase diminishes with increasing
carbon dioxide in the atmosphere. For aerosols, however, the net
effect of increase in density is to reduce the surface
temperature of Earth. Because of the exponential dependence of
the backscattering, the rate of temperature decrease is augmented
with increasing aerosol content. An increase by only a factor of
4 in global aerosol background concentration may be sufficient to
reduce the surface temperature by as much as 3.5 ° K. If
sustained over a period of several years, such a temperature
decrease over the whole globe is believed to be sufficient to
trigger an ice age.
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You are asking someone to explain a hypothesis he never forwarded.