Toronto Sun: At the bottom of the house of sand on which the Kyoto accord and world carbon trading markets are built, there’s a leaking foundation. Otherwise known as a carbon credit. A carbon credit is a permit or, alternatively, a unit of currency, allowing a country or corporation to emit one metric tonne of carbon dioxide, linked to man-made global warming. Carbon credits are the main mechanism by which Kyoto transfers wealth from developed nations like Canada to developing …