WASHINGTON, Aug. 14 -- Sen. Edward J. Markey, D-Mass., has introduced legislation (S. 4523) to regulate large-scale emissions of methane and natural gas. The bill was introduced on Aug. 12. It was referred to the Senate Energy and Natural Resources Committee. For more information, Sen. Edward J. Markey, 255 Dirksen Senate Office Building, Washington, DC 20510; 202/224-2742; or in state at 975 President John F. Kennedy Federal Bldg., 222 Milliken Blvd., Ste. 312, Fall River, MA 02721; 508/677-0523; 1550 Main St., 4th fl., Springfield, MA 01101 more ST