Reuters: As U.S. prospects for a national climate change bill fade, five U.S. states and Canadian provinces are on track to start a cap-and-trade market for carbon dioxide in 2012, say officials who see fading federal momentum boosting regional efforts. California, the keystone market with the eighth-largest economy in the world, New Mexico, and the Canadian provinces of Ontario, British Columbia and Quebec all plan to join the system meant to combat climate change and boost economies by …