WUWT |
Very much in the tradition of Hubert Lamb, he makes a plea for much better understanding of natural variation of climate as a pre-condition for being able to assess our impact on it.
He makes a plausible case that the next 10 to 20 years could be decisive in assessing the strength of human impact (via CO2 in particular) and natural variation on glacier and icecap variation.
Another reason to postpone panic over our CO2 emissions. Unfortunately, we have had panic already, and a great deal of consequent suffering and damage to societies around the world, and indeed to the environment thanks to the headlong rush into bio-fuels and wind-turbines. The damage to children who grew up over the last 20 years or so of intense scaremongering directed at them, and an associated promotion of contempt for industrial progress, may be the biggest harm of all. But who can tell? How could this be measured? How might that damage, however extensive, be repaired?
Jim Steele notes that 'the public remains ill-informed and fearful about the causes of retreating ice'. He presents evidence for solar, and oceanic influences being the dominant sources of variation over the past several thousands of years.
Screenshot from video |
Jim Steele concludes the substance of his presentation with these words:
'With the recent
decline in solar flux, and the shift to cool phases of ocean
oscillations, natural climate change suggests that although glacier
retreat and sea level rise will likely continue for the next few
decades, the rates of sea level rise and glacier retreats will slow
down.
The next decade will
provide the natural experiment to test the validity of competing
hypotheses.
Are changes in the
Earth's ice driven by natural, or by CO2-driven climate change?
I'm betting on
natural climate change.'
It is of particular interest for this blog that as well as being a director of a field centre for nature studies, Jim Steele has decades of high school teaching experience in San Francisco. See: http://www.sfsu.edu/~sierra/Instructor_JimSteele.html
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