Thank you.
Ms. Nowlan, the issue of cumulative effects is an interesting one because little by little a system can be degraded, like a dock here, a culvert there, etc. It raises the issue about how you measure or how you decide when you've reached the tipping point. Are we looking at the prospect of retroactive obligations to the people who maybe have built something there many years earlier or, as some people are fearing, that this could end up with the last one in has to carry the load for the cumulative effects that have gone on for quite some time? Can you comment on that?