SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 12/11/07          |
--------------------------------------------------------------| 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:       23,955
COMMITMENTS
   8,413    5,534    3,096   11,939   15,123   23,448   23,754      507      201

CHANGES FROM 12/04/07 (CHANGE IN OPEN INTEREST:        214)
     878     -720      507   -1,663      274     -279       61      493      153

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    35.1     23.1     12.9     49.8     63.1     97.9     99.2      2.1      0.8

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       35)
      11       12       14       11       12       28       32


Updated December 14, 2007