Via Aledo Times Record:

The Midwest Geological Sequestration Consortium (MGSC) has begun injecting carbon dioxide (CO2) for the first million-tonne demonstration of carbon sequestration in the U.S.  The CO2 will be stored permanently in the Mt. Simon Sandstone more than a mile beneath the Illinois surface at Decatur. The MGSC is led by the Illinois State Geological Survey (ISGS), part of the Prairie Research Institute at the University of Illinois.