Agence France-Presse: An environmental panel urged the Canadian government on Thursday to quickly implement a national carbon pricing policy if it is to meet its targets for cuts in greenhouse gas emissions. In a report, the National Round Table on the Environment and the Economy said the cost of carbon would have to top 100 Canadian dollars (83 US) per ton by 2020, and rise to a maximum of 200 dollars. Eventually, the government must tie in its trading system with other nations’ cap and trade …