Just one week after the U.S. Supreme Court said vehicle carbon dioxide emissions can be regulated like other pollutants, an effort by several states to do that is about to get its first court test.
California long has been the pacesetter in regulating car emissions, setting tougher limits than those imposed by the federal government. To avoid having cars built to meet 50 different sets of state rules, federal law allows other states to choose between the federal and the California rules. Vermont and nine other states follow California. But […]