From the New York Times:

Asian carp, the voracious, nonnative fish whose arrival near Lake Michigan is threatening to cause havoc in the Great Lakes, are now setting off strife on land as well.

In an urgent effort to close down Chicago-area passages that could allow the unwanted fish to reach Lake Michigan, the State of Michigan is suing the State of Illinois and other entities that govern the waterways here. Minnesota, Ohio and Wisconsin have filed documents in recent days supporting Michigan’s move, and Indiana says it will soon do the same.

The new rift between these Midwestern states, which would reopen a nearly century-old legal case in the United States Supreme Court over Great Lakes waters, comes at a particularly sensitive moment — just as the numerous entities with interests in the Great Lakes had united in what lakes advocates consider some of their most significant progress in decades. Read more.