We've been assuming the $15- to $25-per-tonne type of number, which we've been talking about. The federal government has put forward $15 to $20 to $25 a tonne. There are a number of different places where you can purchase credits in that type of range.
When we talk about sequestering, capturing the CO 2 from the flue gas, the costs are much further north, the $50 type of number. The technology isn't clear at this point in time. So very quickly we would be looking to alternatives rather than capturing the CO 2 from the flue gas.