Agence France-Presse: Canada’s industrial heartland is joining a group of US states to launch a North American carbon trading market, Ontario Premier Dalton McGuinty announced Friday. The province is the fourth to join the Western Climate Initiative, which includes also California, Arizona, Montana, New Mexico, Oregon, Utah and Washington. “We’re proud to be welcomed into this important organization of climate change leaders across Canada and the United States,” McGuinty said in a …