From Reuters:
Swiss Re (RUKN.VX) has closed its carbon emissions trading desk, a spokesman said on Friday....In addition, one of the most vocal proponents of cap-and-trade, while pursuing their broader strategic vision:
...Several financial institutions including Credit Suisse (CSGN.VX), Bank of America (BAC.N), and Tullett Prebon have trimmed carbon trading or carbon project origination operations in the past year or so.
Lehman Brothers shuts carbon trading desk (LEH)(that post was dated September 16, 2008, the day after the bankruptcy filing)
And in a deal where Warren Buffet has had investments on both sides:
Goldman Sachs Buys Constellation Energy's Carbon Trading Operation (CEG; GS)