SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
FUTURES ONLY POSITIONS AS OF 04/15/08                         |
--------------------------------------------------------------| 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:       23,659
COMMITMENTS
  10,001    3,657      627   12,902   19,235   23,530   23,519      129      140

CHANGES FROM 04/08/08 (CHANGE IN OPEN INTEREST:        136)
     -14      482       33      208     -220      227      295      -91     -159

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADERS
    42.3     15.5      2.7     54.5     81.3     99.5     99.4      0.5      0.6

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       31)
       9        9        7       11       12       23       25
 

Updated April 18, 2008