[LINK] Weekend Magazine - Remote Siberian Lake Holds Clues to Arctic--and Antarctic--Climate Change

[Gordon Keith]

On Tue, 26 Jun 2012 08:25:34 AM TKoltai wrote:
> He concludes by stipulating that "anthropogenic carbon dioxide warming
> should emerge from the noise level of natural climate variability by the
> end of the Century"
> 
> Quote/
> 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
> 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.
> /quote

In 
http://www.ted.com/talks/james_hansen_why_i_must_speak_out_about_climate_change.html 
(Feb 2012) he states "all these impacts have since happened or are well 
underway" (from 2:45 in the video).

Regards
Gordon