TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	February 28, 2006
SUBJECT:	Chicago Climate Exchange Margin Rate Change

The following margin intervals are effective end of day Tuesday, February 28, 2006.

Contract	From	To
March 2006 Sulfur Dioxide (SFI)	$2,600	$3500

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