$18 billion price put on Great Lakes carp barrier

Keeping Asian carp from entering the Great Lakes in the Chicago area could cost $18 billion and take 25 years to put into practice, a new Army Corps of Engineers study concludes. Read a New York Times article on the research. Read the study, itself.  Watch a video of an October 2013 Freshwater lecture by USGS biologist Duane Chapman on the threat the carp pose to Minnesota.