“This is an historic accomplishment,” said Ronald Pofalla, chairman of the 28-member government commission, at a news conference in Berlin following a marathon 21-hour negotiating session that concluded at 6 a.m. Saturday. The breakthrough ended seven months of wrangling. “It was anything but a sure thing. But we did it,” Pofalla said. “There won’t be any more coal-burning plants in Germany by 2038.”