This is an assumption we made to be able to do this calculation, but different provinces have different systems now. There is a carbon tax in some areas and there are different ways of dealing with that. We didn't really want to do separate calculations for each province. We assumed that on average the carbon tax would be $10 to $50, and that it would be applied all over the country in the same way. We did this just to come up with some estimate of overall impact.
On April 23rd, 2018. See this statement in context.