Physorg: A team of researchers at Carnegie Mellon University report in a new policy brief that cap and trade climate policies alone will not be sufficient to put the nation on track to achieve a 50 to 80 percent reduction in greenhouse gas emissions of carbon dioxide by mid-century. “While a cap and trade or carbon tax policy is an important step in reducing emissions, the range of prices for carbon dioxide permits being discussed will be too low to induce the large-scale investments we need,” …