If the ambition is to drive down carbon emissions, and I think it is, then a broad-based carbon tax would help that objective. What we're trying to do is change behaviour and limit the amount of hydrocarbon that is being burned. That's the advantage of a broad-based carbon tax.
Whether it's carbon-neutral, or greater than that, is a function of how quickly or how thoroughly we want to change behaviour. I'll leave it for governments to make that determination.
We would like to see with whatever money is raised that at least a portion of that comes back in the investment in technology to reduce carbon emissions at the point of production. We think there is a bit of a virtuous circle in terms of increasing investment in technology. Overall, my take on it is that we're trying to influence behaviour.