The U.S. Army Corps of Engineers has released its long-awaited report on how to keep Asian carp from getting into the Great Lakes, outlining a series of possible options that could cost up to $18 billion.

Congress must now decide which option to embrace, said environmentalists who held a phone conference call Tuesday with reporters to discuss the report.

“Congress now has a roadmap to move forward,” said Marc Smith, an official with the National Wildlife Federation.

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