The worst may be over for the U.S. chemical industry, according to economists at the American Chemistry Council, an industry trade association. According to ACC economists, a weak first half of 2009 means that U.S. chemical production will drop 8.1% this year. However, the ACC predicts sales will rise 1.6% in 2010 and 2.2% in 2011. Not exactly reasons for rejoicing, but after nearly two years of recession, expectations for gains have become modest. According to the ACC, positive signs include...