These include a campaign promise to shave one percentage point from the sales tax, and a tax credit on public-transport tickets aimed at encouraging commuters to leave their cars at home.

ECONOMIST: Canada

The right way to deal with greenhouse gases is through economy-wide measures, such as a carbon tax, rather than by picking on road transport, which accounts for only a fifth of all emissions and already pays more in various duties than would be extracted from it through any reasonable level of carbon tax.

ECONOMIST: Roads and rail

The higher the tax, the greater the burden placed on mining, manufacturing, agriculture, transport and data services.

FORBES: Carbon Tax: Will Tweedle Dum Snatch Defeat From the Jaws of Victory?