From Mondaq.com: The introduction of a federal cap-and-trade system in the US would bring significant changes to carbon markets globally. Not only the market would increase, but also the underlying emissions reduction projects would have a more diversified basis.

This will be possible if the Lieberman-Warner Climate Security Act of 2008, as proposed by a bill introduced in the US Senate by Senator Barbara Boxer on May 20,2008, is enacted….. Full Article: Source