Reuters: The Interior Department on Tuesday extended the public comment period by 180 days on a 5-year proposal to expand offshore oil and natural gas drilling. The Bush administration had drawn up an offshore drilling plan during the final days of its term, setting a 60-day comment period for the proposal. New U.S. Interior Secretary Ken Salazar said he would add another 180 days for public comment, providing a total of 240 days to review the drilling plan through this …