SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 12/24/07          |
--------------------------------------------------------------| 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:       13,560
COMMITMENTS
   3,704    2,339    1,377    8,362    9,741   13,443   13,457      117      103

CHANGES FROM 12/18/07 (CHANGE IN OPEN INTEREST:     -1,010)
       6     -548      -48       60      486       18     -110   -1,029     -900

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    27.3     17.2     10.2     61.7     71.8     99.1     99.2      0.9      0.8

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       33)
      10       12       13       10       11       26       30


Updated December 28, 2007