Australia's major alcohol brands on Tuesday launched voluntary health warnings on their labels targeting children, pregnant women and excessive boozing in a country famed for its binge-drinking culture. DrinkWise, an industry body representing 80 percent of Australia's big alcohol names by volume, said new labels would be phased in on beer, wine and spirits carrying warnings on underage drinking and tippling during pregnancy. The new labels are not mandated by the government and are being seen as a pre-emptive strike in the wake of a government crackdown on tobacco.