New York Times: The head of the British research unit at the center of a controversy over the disclosure of thousands of e-mail messages among climate-change scientists has stepped down pending the outcome of an investigation. Phil Jones, the director of the Climatic Research Unit at the University of East Anglia in England, said that he would leave his post while the university conducted a review of the release of the e-mail messages. The university has called the release and publication of the …