TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	February 3,2006
SUBJECT:	Chicago Climate Exchange Margin Rate Change

The following margin intervals are effective end of day Thursday February 2, 2006, through the opening of business on Wednesday February 8, 2006.

Contract	From	To
Sulfur Dioxide	$2,600	$3900

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