Associated Press: A government pledge to slash Australia’s greenhouse gas emissions by 60 percent by midcentury would not stop dangerous global warming and should be extended to an 80 percent target, a report recommended Friday. Prime Minister Kevin Rudd was elected to power last year on a promise to aim for 60 percent cuts in emissions by 2050 — a more ambitious goal than the 50 percent agreed on by leaders at the Group of Eight industrial countries in July. But Ross Garnaut, an economist …