Voice of America: New vehicles await shipment from a wharf in Sydney, Australia (file photo)A new study has shown that Australians have overtaken Americans as the world’s highest per capita carbon dioxide polluters. The global pollution report has been compiled by a British company, Maplecroft. Using U.S. Energy Department data it calculated that Australia’s per capita output of carbon dioxide at 18.66 metric tons a year, four percent higher than the United States. In a list of 185 countries, …