Colorado Biz: The market-based cap-and-trade mechanism for reducing carbon dioxide and other greenhouse emissions is coming rapidly – perhaps as soon as 2012 in the West. Colorado is on the sidelines, taking notes. Despite the campaign of Gov. Bill Ritter to establish a clean energy economy, he elected not to join the Western Climate Initiative. Rules for the emerging market are instead being hammered out by seven states and three Canadian provinces. Their goal is to reduce greenhouse gas emissions …