Dairy farms taking a toll on Great Lakes, waterways

<> Dairy farms taking a toll on Great Lakes, waterways - With blue-green algae blooms becoming a part of summer in Lake Erie and Lake St. Clair, concern is growing that nutrients — including those from cow manure and from large operations with more than 700 milk-producing animals — could be a long-term problem as farmers look for places to put cow waste -- dairy cows defecate more than 80 pounds per day