TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	October 31, 2006
SUBJECT:	Chicago Climate Exchange Margin Rate Change

The following margin intervals are effective end of day Tuesday October 31, 2006.

Contract	From	To
November 2006 Sulfur Dioxide	$975	$1,475

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