The next report is part of coverage of a threat called "point source pollution." The Great Lakes Radio Consortium's Mark Brush reports on how some pipes are still dumping pollution into the Lakes.

The next report in our series, Ten Threats to the Great Lakes, reveals that we still have a long way to go to eliminate pollution in the lakes. The Great Lakes Radio Consortium's Rick Pluta reports on how one of the biggest problem spots isn't in the U.S., but in Canada.