It's naive to think that reducing carbon emissions is costless, writes Thomas Walkom.
The latest pipeline faceoff between Alberta and British Columbia is more than a constitutional tussle.
It is also a reminder of the unresolved contradictions within Prime Minister Justin Trudeau’s climate-change policy.
More specifically, it is a reminder that the core of that policy — the assertion that carbon emissions can be adequately reduced without significant economic cost — is simply not true.