Founded in 1763 by Frederick the Great, Königliche Porzellan-Manufaktur still uses traditional methods to make its high-end porcelain. As in the past, kpm vases and cups are blasted with heat in furnaces: first at 1,000°C, then at 1,400°C. Hardly the cutting edge of German manufacturing—but emblematic. kpm’s fortunes are, like those of German industry as a whole, tied to the availability of cheap natural gas. Its four ovens consume…