The Great Lakes’ record-low water levels are rightly receiving all of the attention now, but evidence is growing that Michigan’s fragile groundwater resources are quietly becoming a concern for the future. Robert Glennon, professor of law and public policy at the University of Arizona and author of “Unquenchable: America’s Water Crisis and What to do About It,” knows Michigan well and shares his insights. Echo has reported on the consequences of drought on Great Lakes groundwater – which can also be seen on this map – and the challenge of measuring its effects. The need for better groundwater conservation continues to be a widely overlooked issue facing the Basin.