Sep 06, 2006 — Loss of wetlands is one of the most serious threats to the environmental health of the Great Lakes and St. Lawrence Seaway. Lots of the wetlands were turned into farmland. Thousands of miles of ditches and trenches were dug to drain the water away. But losing millions of acres of wetlands meant the loss of most of the natural filter for the lakes' waters, as well as habitat for wildlife. More and more farmers are now part of a growing effort to restore what's been lost. The GLRC's Mark Brush has more.