CANBERRA, Australia — Australia’s leader faces her toughest political test to date as she tries to sell the nation on a carbon tax that would lead to higher power prices while reducing greenhouse gas emissions. An increasingly vociferous debate on the issue is dominating headlines and talk radio and could make or break the center-left government of Prime Minister Julia Gillard, who ruled out putting a price on pollution during her campaign and has slumped in opinion polls since she floated the proposal in February. Read full article >>