Australian: A HALF-EATEN hamburger discarded at the opening ceremony of the Brisbane Commonwealth Games in 1982 is as you read this still decomposing in the depths of the nearby Ferny Grove landfill. Which means it’s still contributing to Australia’s greenhouse inventory, more than 25 years after Matilda the giant winking kangaroo lurched around the stadium. Debate over the design of a national greenhouse emissions trading scheme has focused mainly on the multi-billion-dollar consequences of the …