TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	September 21, 2007
SUBJECT:	Chicago Climate Exchange Margin Rate Changes

The following margin intervals are effective close of business Friday September 21, 2007.

Contract	From	To
Carbon Financial Instrument	$275	$175
ECO Clean Energy Index	$400	$750
Sulfur Dioxide pre 2010 - Expiration Month	$1875	$1500
Sulfur Dioxide pre 2010	$1250	$1000
Sulfur Dioxide 2010 & later - Expiration Month	$975	$900
Sulfur Dioxide 2010 & later	$650	$600

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