There has been very important work, through the control of ballast water, that has dramatically reduced the rate of newcomers or undesirable guests in the Great Lakes. It has been quite successful. Unfortunately, it came late, after the invasion of a large number of species there. However, the controls that are now in place have dramatically reduced the rate of invasion. That is one example in which very practical, concrete target measures can work.
In parks last year, due to the threat of a potential invasion by exotic mussels coming from the western United States, we put measures in place to avoid the risk of introducing mussels into Waterton Lakes. Whether it will work in the long term is to be determined, but there are a number of measures that you can put in place.