TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	October 31, 2005
SUBJECT:	Chicago Climate Exchange Margin Rate Change

The following margin intervals are effective November 1, 2005.

Contract	From	To
Sulfur Dioxide	$1950	$1300

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