​Back, for a moment, to that item about concrete-maker Ash Grove suing the city of Plano for refusing to buy its cement, made with the dirty, antiquated wet-kiln method. I do need to clarify a few things: Yes, Plano was originally sued by Ash Grove -- along with Dallas and Fort Worth and Arlington and the Dallas County Schools and Tarrant County -- back in November 2008, as Ash Grove claimed the defendants' decisions to purchase "environmentally preferable" cement was a violation of the compa