It's quite possible that their tolling system will be different in 20 years. We mentioned in the report that the two scenarios we have are only two scenarios. They're not the upper and lower bounds of the present value of the future income streams. There could be many alternative scenarios, depending on what happens with oil production in the oil sands sector and depending on future policy choices of the Government of Canada.
These are not meant to be the upper and lower bounds. There could be other scenarios happening. I'm there with you; depending on what happens with climate policy, the value could be slightly or significantly different.