TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	May 26, 2005
SUBJECT:	Chicago Climate Exchange Spot Month Margin Rate

The following margin interval is effective with the close of business on Tuesday May 31, 2005. :

Chicago Climate Margin Rate for June Delivery	Margin Interval
Sulfur Dioxide	$1800

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