Spiegel: The German wind energy sector is expanding, opening up fresh business opportunities — even for unlikely candidates like warship makers. The Nordseewerke shipyard has rejiggered its business model and decided to go green. Someday the last swords really will be beaten into plowshares, or perhaps it is the warships that will transform into wind turbines — precisely what is taking place at the Nordseewerke shipyard in Emden on Germany’s North Sea coast. At the moment, a gray …