This Earth Day has added meaning, well beyond its 50th milestone. (WK-intern) - The global shutdown response to a dark pandemic has revealed clear skies and vistas not seen in entire decades, along with joblessness and economic freefall not seen in entire lifetimes. Beyond the extraordinary efforts of health care workers, the examples of companies, industries and people stepping up to respond to the crisis are also extraordinary, and too numerous to fully mention. Engine, equipment and vehicle manufacturers turned their engine filtration products into protective masks (Cummins), automakers produced life-saving ventilators in record time (General Motors), one invented laboratory tests and equipment