SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 08/28/07          |
--------------------------------------------------------------| NONREPORTABLE
      NON-COMMERCIAL      |   COMMERCIAL    |      TOTAL      |   POSITIONS
--------------------------|-----------------|-----------------|-----------------
  Long  | Short  |Spreads |  Long  | Short  |  Long  | Short  |  Long  | Short
--------------------------------------------------------------------------------
(CONTRACTS OF 25 U.S. EPA SO2 EMMISSION              OPEN INTEREST:       22,313
COMMITMENTS
   4,149    2,680    2,731   15,202   16,678   22,082   22,089      232      224

CHANGES FROM 08/21/07 (CHANGE IN OPEN INTEREST:      1,276)
    -286      964      319    1,316       28    1,350    1,311      -73      -35

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    18.6     12.0     12.2     68.1     74.7     99.0     99.0      1.0      1.0

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       33)
       9       12       10       12       12       26       29


Updated August 31, 2007