It's clear that a carbon tax is a cost for us; it increases our cost of operation. Yes, we have a regime in place that essentially has, as a purpose, allocating the cost of the carbon tax to the shippers that are triggering its payment. If you don't do that and say you're going to lump it into your overall costs, what happens is that much of your customer base will, for example, assume a cost that is not triggered by their shipments.
A simple example is the B.C. carbon tax. We don't charge the B.C. carbon tax to customers in the Prairies or eastern Canada who are not triggering the carbon tax in B.C. Similarly, we're not charging our U.S. customers for something triggered in Canada, and conversely, we don't charge Canadian shippers for—