The Globe and Mail Bookmark Please log in to listen to this story. Also available in French and Mandarin. Log In Create Free Account Getting audio file ... This translation has been automatically generated and has not been verified for accuracy. Full Disclaimer Since the 2015 election campaign, the federal Liberals have brandished the idea of putting a federal price on carbon pollution as a centrepiece of their strategy to fight climate change. The idea was straightforward. Ottawa would impose a minimum price on carbon, either directly, or by endorsing a provincial plan that adopted that same carbon-cost floor. But, as this week’s Tax and Spend lays out, that straightforward notion has become convoluted in practice.