TO:	ALL CLEARING PARTICIPANTS
FROM:	CLIENT SERVICES AND SUPPORT
DATE:	November 2, 2005
SUBJECT:	Chicago Climate Exchange Margin Rate Change

The following margin intervals are effective end of day Wednesday November 2, 2005, through the midday variation cycle on Monday November 7, 2005. The margin level will revert to $1,300 effective the end of day on Monday.

Contract	From	To
Sulfur Dioxide	$1300	$1950

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