AAP: The scrapping of the carbon tax closes a bitter chapter in Australian politics and offers lessons for the Abbott government in the perils of negotiating climate policy. John Howard first pledged an emissions trading scheme (ETS) ahead of the 2007 election, but it was a triumphant Kevin Rudd who took the first shot at cobbling together parliamentary support for his own cap-and-trade policy. He achieved bipartisan backing for his scheme two years later, only to see it come crashing down when Malcolm...