The iPath Global Carbon ETN (GRNTF) is a mutual fund that tracks the performance of the global carbon market. It is an exchange-traded note (ETN) that provides investors with exposure to the price of carbon emissions through a basket of carbon-related futures contracts. This fund allows investors to participate in the growing market for carbon credits, which are used to offset carbon emissions and promote environmental sustainability. With a focus on global carbon markets, the iPath Global Carbon ETN offers a unique investment opportunity for those interested in both financial and environmental returns.