Though initially costly, such a system would prevent economic turmoil from invasive species and create other benefits, proponents say. (HDR, Inc.) /></div><p>In <a href=http://www.wbez.org/blogs/chris-bentley/2013-04/asian-carp-might-have-entered-lakes-so-what-106613 target=_blank>the perennial battle to keep Asian carp and other riverborne invaders out of the Great Lakes</a>, one interventio