Today, while reading an article on cleantech ETFs by The Motley Fool, I found out that XShares Advisors LLC and the Chicago Climate Exchange were working on a carbon emissions-based ETF (PDF document). There is not a lot of info available on what exactly this ETF will track. We reported back in November that UBS had launched an index based on European carbon prices. As noted by Richard Kang at around the same time, this index is well-suited for something like an ETF. If any of our readers have any further insight on this, don’t hesitate to share it with the rest of us.