Certainly in the contaminated sediment field that's correct. These are legacy problems.
What's changed in the Great Lakes since we started working in the 1970s is that we now have national legislation and provincial legislation that controls the discharge of chemicals. Federally we have the chemical management plan and the Canadian Environmental Protection Act. We're constantly assessing new chemicals and trying to prevent the release of harmful chemicals into the environment.
Really, our contribution to that at an ecosystem level is to address those legacy problems.