Sent the following to the News and Observer of Raleigh, they printed it on 11/9/12 (link to online version complete with reader comments below):
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In his letter of 11/7, William Everett reports that
scientists found a case where temperatures increased before atmospheric carbon
dioxide concentrations. Everett claims
this finding invalidates the climate change concept that increasing carbon
dioxide concentrations cause temperature increases, since one would expect the
carbon dioxide to increase first if it caused a temperature increase.
I believe the report Everett cites refers to climate 20
thousand years ago, and there are times in Earth's history where temperature
does increase first, and a carbon dioxide increase follows. What Everett failed to add is that oftentimes
when this happens, the increase in carbon dioxide causes a further and much
larger increase in temperature. And the
initial smaller temperature rise was caused by changes in Earth's orbit and
orientation (Milankovitch cycles) that simply do not cause today's warming.
A study by Jeremy Shakun, published in the science journal,
Nature (volume 484, April 2012), presents convincing evidence that rising carbon
dioxide concentrations caused global temperatures to increase from 18 to 11
thousand years ago. This is but one of
many lines of evidence indicating that rising carbon dioxide concentrations in
our atmosphere do cause an increase in temperature and consequent climate
changes.
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http://www.newsobserver.com/2012/11/09/2472857/denis-dubay-greenhouse-effect.html
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