This ETN was delisted on April 12, 2018, and now trades over-the-counter on the pink sheets. As a result, shareholders should anticipate ultra-wide spreads, minimal trading volumes, and prices well above or below NAVs. GRN is on the bleeding edge, and investors have suffered for it. The ETN offers exposure to the thinly traded and poorly developed global carbon markets as represented by a Barclays index that measures the performance of emissions units issued under the Kyoto protocol. Unfortunately for GRN, there's much deserved skepticism about the viability of that carbon market. Investors determined to invest in GRN will have to circumvent mile wide bid/ask spreads and hope the fund doesn't close before carbon markets develop further.