LOS ANGELES (AP) - Southern California clean air regulators adopted a plan Friday to reduce emissions at about 300 power plants, factories and refineries by 20 percent over five years. The plan, which takes effect beginning 2007, amends a program started 10 years ago by the South Coast Air Quality Management District and seeks to reduce smog-causing emissions by a total of 7.7 tons per day over the five-year period. "We believe the changes meet state law requirements and maintain the integrity of the program, while continuing to move closer to the region's air quality goals," Barry Wallerstein, executive officer...