New Scientist: Australia has pledged to cut its greenhouse emissions by 5 to 15% by 2020 as it unveiled the world’s broadest carbon-trading scheme. Australia is now second only to the EU in its drive to cut emissions by establishing a cap-and-trade system that puts a price on carbon output. However, environmentalists have blasted the trading plan, saying that it will give free credits to some of the economy’s most polluting industries. Australian prime minister Kevin Rudd says the carbon …