Journal Sentinel: Towering above farm fields on the Niagara Escarpment south of Green Bay are some of the tallest wind turbines in the nation – rising nearly 500 feet from the ground to the tip of a blade, only about 100 feet shorter than Wisconsin’s highest skyscraper, the U.S. Bank building in Milwaukee. The Shirley Wind project is small by another measure, numbering only eight turbines, compared with the 90 turbines We Energies is building at the Glacier Hills Wind Park north of Madison. But the turbines that…