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Submitted on: 07 April 2006.
Revised on: 07 July 2006.
Accepted on: 01 August 2006.
___________________Earths Future---AMER GEOPHYSICAL UNION
Submitted on: 20 December 1999.
Revised on: 08 March 2000.
Accepted on: 19 April 2000.
___________________Earths Future---AMER GEOPHYSICAL UNION
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