Australian Broadcasting Corporation: Three years ago then-prime minister Julia Gillard promised there would not be a carbon tax under a government she led.
After the 2010 federal election resulted in a hung Parliament, Ms Gillard signed an agreement with the Greens to introduce a price on carbon from 2015, with a transitional period of a fixed carbon tax.
Backtracking on her campaign promise fatally undermined Ms Gillard's leadership and the standing of her government.
Trust is the currency of politics and once spent can never...