NYSE Euronext (NYX) today announced the launch of 11 new Barclays iPathExchange Traded Notes (ETNs) on NYSE Arca, including the first ETN linked to carbon. ETFs and ETNs listed on NYSE Arca - an industry leader in ETF and ETN listings and trading - represent 56% of ETF and ETN assets under management in the U.S., nearly $609 billion, the most of any exchange.