SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 08/21/07          |
--------------------------------------------------------------| 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:       21,037
COMMITMENTS
   4,435    1,716    2,411   13,886   16,650   20,732   20,778      305      259

CHANGES FROM 08/14/07 (CHANGE IN OPEN INTEREST:       -369)
     692     -206       88   -1,020      -82     -240     -200     -130     -169

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    21.1      8.2     11.5     66.0     79.1     98.5     98.8      1.5      1.2

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       34)
      12       10       11       10       12       25       30


Updated August 24, 2007