SULFUR FINANCIAL INSTRUMENT - CHICAGO CLIMATE FUTURES EXCHANGE       Code-006261
FUTURES ONLY POSITIONS AS OF 05/06/08                         |
--------------------------------------------------------------| 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:       24,921
COMMITMENTS
  10,562    4,285      328   13,957   20,269   24,847   24,882       74       39

CHANGES FROM 04/29/08 (CHANGE IN OPEN INTEREST:     -1,351)
       1      706   -1,279      158     -483   -1,120   -1,056     -231     -295

PERCENT OF OPEN INTEREST FOR EACH CATEGORY OF TRADERS
    42.4     17.2      1.3     56.0     81.3     99.7     99.8      0.3      0.2

NUMBER OF TRADERS IN EACH CATEGORY (TOTAL TRADERS:       32)
      10        8        6       13       13       26       24
 

Updated May 9, 2008