With the launch of AirShares (ASO) Carbon Commodity Pool Fund today, investors now have two easily accessible choices for carbon trading with the iPath Global Carbon ETN (GRN) already on the market since early July. Below are links to my articles on carbon trading over the past four months: 12/14/08 – AirShares (ASO) Carbon Fund Begins Trading 10/17/08 – Carbon ETN: Solid Returns, Few Investors 10/6/08 – Carbon ETN Outpaces Oil and Natural Gas ETFs 9/12/08 – Carbon Holds Up Against Other Commodities 8/26/08 – Carbon ETN Holds Steady, Outperforms Oil and Natural Gas 8/24/08 – Carbon Allowance Futures Commence U.S. Trading 8/21/08 – A New Index for Carbon Credit Trading 8/13/08 – Carbon Prices Rebound, Diverge from Falling Oil 8/6/08 – Carbon Prices Fall Along with Oil and Other Commodities