On Sat, 1 Oct 2011 17:30:35 +1000, "Trevor Wilson"
wrote:

http://802.11junk.com/jeffl/crud/Vostok_Petit_data_03.jpg

**I've studied the graphs in some considerable detail over the years and
have noted that CO2 rise sometimes precedes temperature rise and sometimes
it lags. This fits in well with current theory on how temperature changes
have occured in the past. Not all have been caused by CO2 rise. The most
important factor to note, however, is that CO2 levels and temperature levels
track each other very closely. When one goes up, the other does too.

You can't have it both ways. Either warming causes a CO2 increase, or
CO2 causes a warming increase. Since they track each other, it's
presumed that there's a cause and effect mechanism in operation. If
your claim of mutual causality were true, where an increase in either
factor causes an increase in the other, then that's positive feedback.
Temperature and CO2 would simply increase without any limit, causing
the planet to look like Venus. We've survived 5 temperature cycles in
the last 500,000 years which demonstrates that it's NOT postive
feedback.

http://rps3.com/Files/AGW/VOSTOKICECoreObservations_Stewart2009.pdf
Assuming the five temperature maximums are related to the 1st
Order 100,000 year Milankovitch cycles, CO2 had little effect
is maintaining the high temperatures. As seen in Cycle 4,
even though CO2 levels were at maximum 299 ppmv CO2,
temperature did not continue to increase, but actually made
a abrupt reversal. Therefore it appears that the mechanical
temperature rise & fall associated with 1st order Milankovitch
cycles appear to overwhelm any warming effect associated with
CO2, for CO2 levels below 299 ppmv;

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558