PHILADELPHIA -- When the Allies needed a weapon terrible enough to end World War II, scientists devised the atomic bomb. When the Soviet Union hurled Sputnik into space, American scientists rallied to build the world's top space program. When Jim Freihaut goes to work each day, he doesn't have to win a war or outfox a Communist foe. All he has to do is crack a market, a market that has stubbornly resisted the notion of energy-efficient buildings for decades. That might be tough enough.