Well, they've made it look prettier. Zebra mussels have cleaned up things an awful lot. I've often crossed the bridge over the Detroit River and the St. Clair River. If you crossed it in 1970, it was a pretty grey-looking body and today it's a very bright effervescent blue. So there has been a cosmetic improvement, and zebra mussels of course are becoming less of an issue as the quagga mussels take over.
We have all these issues, you know. There's been an awful lot of improvement made, but since 1986 or 1987 up to...for a considerable period of time, there was something like 34 new invasive species that were non-indigenous that came into our waterways.
It is fair to say though, that since 2006, not one has been identified as new. So there's been a substantial improvement with the ballast water that created the problem in the first place. The improvements are working very well. In fact, in Washington there's a ballast water meeting next week.