Based on the aggregated intelligence of 180,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, the iPath Global Carbon ETN (NYSEMKT:GRN) has received the dreaded one-star ranking.

With that in mind, let's take a closer look at GRN and see what CAPS investors are saying about the ETF right now.

GRN facts


June 2008

Total Net Assets

$920 thousand

Investment Approach

Seeks to replicate the Barclays Capital Global Carbon Index Total Return. The index is designed to measure the performance of the most liquid carbon-related credit plans and is designed to be an industry benchmark for carbon investors.

Expense Ratio


1-Year / 3-Year / 5-Year Return

(56.6%) / (42%) / (36.2%)

Sources: S&P Capital IQ and Motley Fool CAPS.

On CAPS, 54% of the 28 members who have rated GRN believe the ETF will underperform the S&P 500 going forward.

Just yesterday, one of those Fools, All-Star TerryHogan, succinctly summed up the GRN bear case for our community:

People are too busy looking for jobs to care about carbon emissions. Besides, there is already a huge transition to cleaner forms of energy (Natgas is so cheap in North America). Until China and India are growing faster than [8% per year] I'm not too bullish on the future of carbon credits.

Fool contributor Brian Pacampara and The Motley Fool have no position in any stocks mentioned. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.