With the European Emissions Trading Scheme closed to private investors you may have felt unfairly ostracised from this booming $30 billion market that has trebled in value in just 24 months. With news on July 27th that The Western Climate Initiative in the US will have a fully operational cap-and-trade system by January 2012 investors are keen to take advantage of the option to purchase at $15 per metric tonne. The WCI have estimated a price of $33 and would trade around $21 billion of carbon credits per year.