AAP: Australia has no plans to follow the US and Britain in adopting a tougher target to slash greenhouse gas emissions. The US and and Britain have promised to cut emissions by 80 per cent by 2050. US President-elect Barack Obama referred to the target in a speech on Tuesday, and said he would launch an emissions trading scheme to achieve the cuts. British politicians recently signed off on a move to toughen up the 2050 target from a 60 per cent cut to 80 per …