SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
OPTION AND FUTURES COMBINED POSITIONS AS OF 04/01/08          |
--------------------------------------------------------------| 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:       35,383
COMMITMENTS
   9,924    2,931    3,414   21,967   28,974   35,305   35,319       78       64

CHANGES FROM 03/25/08 (CHANGE IN OPEN INTEREST:      2,071)
    -197     -352       59    2,270    2,658    2,132    2,366      -61     -294

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADER
    28.0      8.3      9.6     62.1     81.9     99.8     99.8      0.2      0.2

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       32)
      11        8       13       13       13       30       28


Updated April 4, 2008