TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	June 15, 2007
SUBJECT:	Chicago Climate Exchange Margin Rate Change.

The following margin intervals are effective close of business Friday June 15, 2007.

Contract	From	To
March 2007 Sulfur Dioxide	$1475	$1875
Pre-2010 Expirations	$975	$1250
2010 & Later Expirations	$400	$650

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