Australian Broadcasting Corporation: THE Australian Greens say economist Ross Garnaut’s proposed greenhouse targets are weak and based on outdated science. Professor Garnaut has recommended a 10 per cent cut in emissions by 2020. The Greens are urging Prime Minister Kevin Rudd to instead pursue a target of 40 per cent. “This is a weak outcome that is not defensible when you look at catastrophic implications for global environment, lifestyle and economy by mid-century let alone next century,” party leader …