March 30, 1979: Two days after a reactor at Pennsylvania's Three Mile Island complex (at right) appears to narrowly avoid disaster, Pennsylvania Gov. Richard Thornburgh orders an evacuation for pregnant woman and children less than 5 years old who live within five miles of the plant.
March 30, 1999: California Gov. Gray Davis announces that the state will ban the use of Methyl Tertiary Butyl Ether (MTBE), a gasoline additive intended to boost mileage. MTBE is found to cause serious groundwater pollution problems if spilled or leaked.
March 30, 2009: U.S. President Barack Obama signs sweeping wilderness legislation, bringing 2 million acres in nine states under protection.
March 30, 2012: The U.S. Food and Drug Administration turns down a petition to ban the chemical Bisphenol A from food packaging despite a growing body of evidence of its health impacts. FDA stops short of assuring the safety of BPA, though.
Photo: Carolyn Kaster/AP