New York Times: BEHIND a giant solar factory here, backhoes are digging away, preparing for a new wing that will quintuple production. Inside, an outspoken German executive named Boris Klebensberger is fretting about the color of the new carpet. Samples perch on his window sill alongside floor plans. Expanding a factory? Picking out carpeting? Did anyone tell him that there’s a recession? Buoyed by the potential promise of a green economy, Mr. Klebensberger, who heads the American …