Using Science and Technology to Illustrate the Unseen

Chicago reversed the flow of the Chicago River to improve drinking water and sewage disposal. The same engineered waterway, however, provides a conduit for species invasions, which have caused some of the most damaging changes to the Great Lakes. New technologies, including eDNA species surveillance, and new interdisciplinary research, including bioeconomic forecasting, reveal these and other previously unseen threats in time to better balance Great Lakes ecosystem services in future.