Motley Fool: Former Vice President Al Gore thinks energy investors stand to lose $7 trillion when the carbon assets that are littering the balance sheets of multinational energy companies become worthless. He gets this number from a report by the Carbon Tracker Initiative, which suggests that the balance sheets of fossil fuel companies are littered with "unburnable" carbon.
This unburnable carbon is the oil, gas, and coal that is still in the earth that, if extracted and burned, would push the globe over the...