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Which is it James?
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Author:  Milton Banana [ Thu Jul 04, 2013 10:44 am ]
Post subject:  Which is it James?

http://www.climatechangedispatch.com/11 ... ch+news%29

[quote1988: The Sun controls climate
1988: Hansen 99% certain man-made CO2 controls climate
1998: Hansen says "the forces that drive long-term climate change are not known with accuracy sufficient to define future climate change."
2010: Hansen calls for razing cities to the ground, blowing up dams and switching off the greenhouse gas emissions machine
2013: Hansen's mea culpa? Says global warming has slowed due to surge in coal use
2013: Hansen says NOAA is a denier][/quote]

Author:  Wayne Stollings [ Thu Jul 04, 2013 11:39 am ]
Post subject:  Re: Which is it James?

The ignorance of science and the willful attempt to mislead is strong here.


Milton Banana wrote:
http://www.climatechangedispatch.com/11391-hansen-1988-the-sun-controls-climate.html?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+climatechangedispatch%2FnkcO+%28Climate+Change+Dispatch+news%29

1988: The Sun controls climate


The paper indicates climate tracks the solar output for a period through 1987, but it diverges after this paper is written.


Quote:
1988: Hansen 99% certain man-made CO2 controls climate


It appears the unreferenced statement was that human emissions of CO2 was changing the climate which is different from saying it alone "controls" climate, as implied.

Quote:
1998: Hansen says "the forces that drive long-term climate change are not
known with accuracy sufficient to define future climate change."


The difference between a long term climate driver and a shorter term driver is significant. Given there is no context for the timeframe being discussed, there is not a lot which can accurately be taken from the quote. However, if one reads the following sentences there is a better understanding.

http://www.pnas.org/content/95/22/12753.long

Anthropogenic greenhouse gases (GHGs), which are well measured, cause a strong positive (warming) forcing. But other, poorly measured, anthropogenic forcings, especially changes of atmospheric aerosols, clouds, and land-use patterns, cause a negative forcing that tends to offset greenhouse warming. One consequence of this partial balance is that the natural forcing due to solar irradiance changes may play a larger role in long-term climate change than inferred from comparison with GHGs alone.

Quote:
2010: Hansen calls for razing cities to the ground, blowing up dams and switching off the greenhouse gas emissions machine
2013: Hansen's mea culpa? Says global warming has slowed due to surge in coal use
2013: Hansen says NOAA is a denier


Links to other blog "interpretations" of what may have been meant ... which really have nothing to do with the supposed tack of the initial blog. :eh:

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