Age: EVERYONE in the Opposition needs to take a deep breath. Things could get a little sticky in the next week. Brendan Nelson, apparently inured to political pain, wants to toughen the Coalition’s policy on emissions trading. In a nutshell, he would like the Opposition to shift from saying the Coalition believes Australia should start its scheme by 2012 regardless of what other countries do, to a position that links Australia’s start more to when countries such as China, India and …