Business Spectator: I thought it a tad ironic last week that, while the Prime Minister was using Al Gore and a new blog as props in his campaign for the August passage of the emissions trading scheme through the Senate, the miners of his home State were telling the world that they have chalked up 887.4 million tonnes of export coal sales in the past six years. By comparison, Queensland`s power generators have consumed about 140 million tonnes of coal in the same period. Even allowing for the ETS …