TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	August 1, 2006
SUBJECT:	Chicago Climate Exchange SFI Futures Margin

The following margin changes are effective immediately. :

Chicago Climate Margin Rate for SFI Futures Contract Months	From	To
August 2006 Sulfur Dioxide	$3,500	$5,250
September 2006 – December 2009 Sulfur Dioxide	$2,600	$3,900
December 2010 – December 2014 Sulfur Dioxide	$1,300	$1,950

Should you have any questions, please call or e-mail one of the following Client Services and Support Representatives: