GRN’s recent gains may be short-lived. Certified Emission Reductions, or CERs, being issued by the UN in 2014 may drop 23% from this year, Bloomberg reports.

Additionally, adoption of carbon as a clean energy alternative could be hampered by cheap natural gas prices and an abundance of solar power. Even with its recent pop, GRN is still down 32% year-to-date while the Guggenheim Solar ETF (NYSEArca: TAN) is this year’s top-performing non-leveraged ETF with a gain of almost 69%.

iPath Global Carbon ETN

ETF Trends editorial team contributed to this article.

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