The chairman of the California Air Resources Board, Robert F. Sawyer, was fired by Gov. Arnold Schwarzenegger this week amid mounting criticism of the agency's leadership on global warming and air pollution policies. Sawyer and the governor's office gave sharply differing accounts of why he was let go after 18 months at the helm of what has long been described as the world's most influential air pollution regulatory agency. "I was fired, I did not resign…. The entire issue is the independence of the board, and that's why I got fired," Sawyer . . . Sawyer said he had declined...