A new report claims that 60-80% of coal and gas reserves of listed firms are unburnable. That's if the carbon emissions agreement made in 2010 among governments has teeth. According to this agreement emissions must be cut to limit global temperature increases to no more than 2%.

The report by Carbon Tracker and the Grantham Institute at LSE says that if current levels of capital spending continue over the next decade, then over $6 trillion will be allocated to developing fossil fuels. And it says much of this will be wasted on unburnable assets.