In a burst of green penmanship, Gov. Arnold Schwarzenegger signed 29 environmental bills into law Thursday on a wide range of issues. One will require all new cars for sale in California starting in 2009 to display stickers explaining how many tons of global warming-causing gases they emit. Another, from a Palo Alto lawmaker, bans sewage dumping and garbage burning from commercial ships within three miles of the coast. Others will require a study of the aging levee system in the Sacramento-San Joaquin River Delta, prohibit the use of experimental pesticides around schools, phase out mercury in industrial switches and...