TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	September 28, 2006
SUBJECT:	Chicago Climate Exchange Sulfur Financial Instruments (SFI) Futures Margin

The following margin changes are effective immediately. :

Chicago Climate Margin Rate for SFI Futures Contract Months	From	To
September 2006	$2,600	$975
October 2006	$2,600	$975
November 2006	$2,600	$975
December 2006	$2,600	$975
March 2007	$2,600	$975
June 2007	$2,600	$975
September 2007	$2,600	$975
December 2007	$2,600	$975
December 2008	$2,600	$975
December 2009	$2,600	$975
December 2010	$1,300	$400
December 2011	$1,300	$400
December 2012	$1,300	$400
December 2013	$1,300	$400
December 2014	$1,300	$400

In addition, the spread credit for the SFI futures contract will be increased to 80% from 50% for all available contract months.

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